diff --git a/.travis.yml b/.travis.yml
index 947bc54..690909a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 language: node_js
 node_js:
-  - "6"
   - "8"
   - "10"
+  - "12"
 notifications:
   email: false
 sudo: false
diff --git a/package-lock.json b/package-lock.json
index 75e9ec0..19b8733 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,18 +5,18 @@
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.5.5",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
-      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+      "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
       "dev": true,
       "requires": {
-        "@babel/highlight": "^7.0.0"
+        "@babel/highlight": "^7.8.3"
       }
     },
     "@babel/highlight": {
-      "version": "7.5.0",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
-      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.8.3.tgz",
+      "integrity": "sha512-PX4y5xQUvy0fnEVHrYOarRPXVWafSjTW9T0Hab8gVIawpl2Sj0ORyrygANq+KjcNlSSTw0YCLSNA8OyZ1I4yEg==",
       "dev": true,
       "requires": {
         "chalk": "^2.0.0",
@@ -25,33 +25,33 @@
       }
     },
     "@sinonjs/commons": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.6.0.tgz",
-      "integrity": "sha512-w4/WHG7C4WWFyE5geCieFJF6MZkbW4VAriol5KlmQXpAQdxvV0p26sqNZOW6Qyw6Y0l9K4g+cHvvczR2sEEpqg==",
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.7.0.tgz",
+      "integrity": "sha512-qbk9AP+cZUsKdW1GJsBpxPKFmCJ0T8swwzVje3qFd+AkQb74Q/tiuzrdfFg8AD2g5HH/XbE/I8Uc1KYHVYWfhg==",
       "dev": true,
       "requires": {
         "type-detect": "4.0.8"
       }
     },
     "@sinonjs/formatio": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/@sinonjs/formatio/-/formatio-3.2.1.tgz",
-      "integrity": "sha512-tsHvOB24rvyvV2+zKMmPkZ7dXX6LSLKZ7aOtXY6Edklp0uRcgGpOsQTTGTcWViFyx4uhWc6GV8QdnALbIbIdeQ==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/@sinonjs/formatio/-/formatio-4.0.1.tgz",
+      "integrity": "sha512-asIdlLFrla/WZybhm0C8eEzaDNNrzymiTqHMeJl6zPW2881l3uuVRpm0QlRQEjqYWv6CcKMGYME3LbrLJsORBw==",
       "dev": true,
       "requires": {
         "@sinonjs/commons": "^1",
-        "@sinonjs/samsam": "^3.1.0"
+        "@sinonjs/samsam": "^4.2.0"
       }
     },
     "@sinonjs/samsam": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-3.3.3.tgz",
-      "integrity": "sha512-bKCMKZvWIjYD0BLGnNrxVuw4dkWCYsLqFOUWw8VgKF/+5Y+mE7LfHWPIYoDXowH+3a9LsWDMo0uAP8YDosPvHQ==",
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-4.2.2.tgz",
+      "integrity": "sha512-z9o4LZUzSD9Hl22zV38aXNykgFeVj8acqfFabCY6FY83n/6s/XwNJyYYldz6/9lBJanpno9h+oL6HTISkviweA==",
       "dev": true,
       "requires": {
-        "@sinonjs/commons": "^1.3.0",
-        "array-from": "^2.1.1",
-        "lodash": "^4.17.15"
+        "@sinonjs/commons": "^1.6.0",
+        "lodash.get": "^4.4.2",
+        "type-detect": "^4.0.8"
       }
     },
     "@sinonjs/text-encoding": {
@@ -68,22 +68,36 @@
     "acorn": {
       "version": "7.1.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
-      "integrity": "sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==",
-      "dev": true
+      "integrity": "sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ=="
     },
     "acorn-jsx": {
-      "version": "5.0.2",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.2.tgz",
-      "integrity": "sha512-tiNTrP1MP0QrChmD2DdupCr6HWSFeKVw5d/dHTu4Y7rkAkRhU/Dt7dphAfIUyxtHpl/eBVip5uTNSpQJHylpAw==",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.1.0.tgz",
+      "integrity": "sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw==",
       "dev": true
     },
+    "acorn-node": {
+      "version": "1.8.2",
+      "resolved": "https://registry.npmjs.org/acorn-node/-/acorn-node-1.8.2.tgz",
+      "integrity": "sha512-8mt+fslDufLYntIoPAaIMUe/lrbrehIiwmR3t2k9LljIzoigEPF27eLk2hy8zSGzmR/ogr7zbRKINMo1u0yh5A==",
+      "requires": {
+        "acorn": "^7.0.0",
+        "acorn-walk": "^7.0.0",
+        "xtend": "^4.0.2"
+      }
+    },
+    "acorn-walk": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.0.0.tgz",
+      "integrity": "sha512-7Bv1We7ZGuU79zZbb6rRqcpxo3OY+zrdtloZWoyD8fmGX+FeXRjE+iuGkZjSXLVovLzrsvMGMy0EkwA0E0umxg=="
+    },
     "ajv": {
-      "version": "6.10.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
-      "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
+      "version": "6.11.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.11.0.tgz",
+      "integrity": "sha512-nCprB/0syFYy9fVYU1ox1l2KN8S9I+tziH8D4zdZuLT3N6RMlGSGt5FSTpAiHB/Whv8Qs1cWHma1aMKZyaHRKA==",
       "dev": true,
       "requires": {
-        "fast-deep-equal": "^2.0.1",
+        "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",
         "json-schema-traverse": "^0.4.1",
         "uri-js": "^4.2.2"
@@ -102,15 +116,18 @@
       "dev": true
     },
     "ansi-escapes": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
-      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
-      "dev": true
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.0.tgz",
+      "integrity": "sha512-EiYhwo0v255HUL6eDyuLrXEkTi7WwVCLAw+SeOQ7M7qdun1z1pum4DEm/nuqIVbPvi9RPPc9k9LbyBv6H0DwVg==",
+      "dev": true,
+      "requires": {
+        "type-fest": "^0.8.1"
+      }
     },
     "ansi-regex": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
-      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
       "dev": true
     },
     "ansi-styles": {
@@ -122,6 +139,16 @@
         "color-convert": "^1.9.0"
       }
     },
+    "anymatch": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz",
+      "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==",
+      "dev": true,
+      "requires": {
+        "normalize-path": "^3.0.0",
+        "picomatch": "^2.0.4"
+      }
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -140,8 +167,7 @@
     "array-from": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/array-from/-/array-from-2.1.1.tgz",
-      "integrity": "sha1-z+nYwmYoudxa7MYqn12PHzUsEZU=",
-      "dev": true
+      "integrity": "sha1-z+nYwmYoudxa7MYqn12PHzUsEZU="
     },
     "array-map": {
       "version": "0.0.0",
@@ -245,6 +271,12 @@
       "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.1.tgz",
       "integrity": "sha512-mLQ4i2QO1ytvGWFWmcngKO//JXAQueZvwEKtjgQFM4jIK0kU+ytMfplL8j+n5mspOfjHwoAg+9yhb7BwAHm36g=="
     },
+    "binary-extensions": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.0.0.tgz",
+      "integrity": "sha512-Phlt0plgpIIBOGTT/ehfFnbNlfsDEiqmzE2KRXoX1bLIlir4X/MR+zSyBEkL05ffWgnRSf/DXv+WrUAVr93/ow==",
+      "dev": true
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -255,6 +287,15 @@
         "concat-map": "0.0.1"
       }
     },
+    "braces": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
+      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
+      "dev": true,
+      "requires": {
+        "fill-range": "^7.0.1"
+      }
+    },
     "brfs": {
       "version": "1.6.1",
       "resolved": "https://registry.npmjs.org/brfs/-/brfs-1.6.1.tgz",
@@ -370,13 +411,29 @@
       "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
       "dev": true
     },
+    "chokidar": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.3.0.tgz",
+      "integrity": "sha512-dGmKLDdT3Gdl7fBUe8XK+gAtGmzy5Fn0XkkWQuYxGIgWVPPse2CxFA5mtrlD0TOHaHjEUqkWNyP1XdHoJES/4A==",
+      "dev": true,
+      "requires": {
+        "anymatch": "~3.1.1",
+        "braces": "~3.0.2",
+        "fsevents": "~2.1.1",
+        "glob-parent": "~5.1.0",
+        "is-binary-path": "~2.1.0",
+        "is-glob": "~4.0.1",
+        "normalize-path": "~3.0.0",
+        "readdirp": "~3.2.0"
+      }
+    },
     "cli-cursor": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
-      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
       "dev": true,
       "requires": {
-        "restore-cursor": "^2.0.0"
+        "restore-cursor": "^3.1.0"
       }
     },
     "cli-width": {
@@ -396,6 +453,18 @@
         "wrap-ansi": "^5.1.0"
       },
       "dependencies": {
+        "emoji-regex": {
+          "version": "7.0.3",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+          "dev": true
+        },
         "string-width": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
@@ -454,17 +523,17 @@
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     "convert-source-map": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.6.0.tgz",
-      "integrity": "sha512-eFu7XigvxdZ1ETfbgPBohgyQ/Z++C0eEhTor0qRwBw9unw+L0/6V8wkSuGgzdThkiS5lSpdptOQPD8Ak40a+7A==",
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.7.0.tgz",
+      "integrity": "sha512-4FJkXzKXEDB1snCFZlLP4gpC3JILicCpGbzG9f9G7tGqGCzETQ2hWPrcinA9oU4wtf2biUaEH5065UnMeR33oA==",
       "requires": {
         "safe-buffer": "~5.1.1"
       }
     },
     "core-js": {
-      "version": "2.6.9",
-      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.9.tgz",
-      "integrity": "sha512-HOpZf6eXmnl7la+cUdMnLvUxKNqLUzJvgIziQ0DiF3JwSImNphIqdGqzj6hIKyX04MmV0poclQ7+wjWvxQyR2A=="
+      "version": "2.6.11",
+      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.11.tgz",
+      "integrity": "sha512-5wjnpaT/3dV+XB4borEsnAYQchn00XSgTAWKDkEqv+K8KevjbzmofK6hfJ9TZIlpj2N0xQpazy7PiRQiWHqzWg=="
     },
     "core-util-is": {
       "version": "1.0.2",
@@ -489,6 +558,15 @@
       "resolved": "https://registry.npmjs.org/crypto-js/-/crypto-js-3.1.9-1.tgz",
       "integrity": "sha1-/aGedh/Ad+Af+/3G6f38WeiAbNg="
     },
+    "d": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/d/-/d-1.0.1.tgz",
+      "integrity": "sha512-m62ShEObQ39CfralilEQRjH6oAMtNCV1xJyEx5LpRYUVN+EviphDgUc/F3hnYbADmkiNs67Y+3ylmlG7Lnu+FA==",
+      "requires": {
+        "es5-ext": "^0.10.50",
+        "type": "^1.0.1"
+      }
+    },
     "debug": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
@@ -518,9 +596,9 @@
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     "deep-equal": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/deep-equal/-/deep-equal-1.1.0.tgz",
-      "integrity": "sha512-ZbfWJq/wN1Z273o7mUSjILYqehAktR2NVoSrOukDkU9kg2v/Uv89yU4Cvz8seJeAmtN5oqiefKq8FPuXOboqLw==",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/deep-equal/-/deep-equal-1.1.1.tgz",
+      "integrity": "sha512-yd9c5AdiqVcR+JjcwUQb9DkhJc8ngNr0MahEBGvDiJw8puWab2yZlh+nkasOnZP+EGTAP6rRp2JzJhJZzvNF8g==",
       "requires": {
         "is-arguments": "^1.0.4",
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@@ -579,9 +657,9 @@
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-          "version": "2.3.6",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
-          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
+          "version": "2.3.7",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
+          "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
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             "core-util-is": "~1.0.0",
             "inherits": "~2.0.3",
@@ -603,9 +681,9 @@
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-      "version": "7.0.3",
-      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
-      "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
       "dev": true
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@@ -621,6 +699,7 @@
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+      "dev": true,
       "requires": {
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         "function-bind": "^1.1.1",
@@ -634,12 +713,78 @@
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+      "dev": true,
       "requires": {
         "is-callable": "^1.1.4",
         "is-date-object": "^1.0.1",
         "is-symbol": "^1.0.2"
       }
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+    "es5-ext": {
+      "version": "0.10.53",
+      "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.53.tgz",
+      "integrity": "sha512-Xs2Stw6NiNHWypzRTY1MtaG/uJlwCk8kH81920ma8mvN8Xq1gsfhZvpkImLQArw8AHnv8MT2I45J3c0R8slE+Q==",
+      "requires": {
+        "es6-iterator": "~2.0.3",
+        "es6-symbol": "~3.1.3",
+        "next-tick": "~1.0.0"
+      }
+    },
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@@ -2418,6 +2955,18 @@
         "string-width": "^3.0.0"
       },
       "dependencies": {
+        "emoji-regex": {
+          "version": "7.0.3",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+          "dev": true
+        },
         "string-width": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
@@ -2452,9 +3001,9 @@
       },
       "dependencies": {
         "readable-stream": {
-          "version": "2.3.6",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
-          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
+          "version": "2.3.7",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
+          "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
           "requires": {
             "core-util-is": "~1.0.0",
             "inherits": "~2.0.3",
@@ -2476,9 +3025,9 @@
       }
     },
     "tiny-inflate": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/tiny-inflate/-/tiny-inflate-1.0.2.tgz",
-      "integrity": "sha1-k9nez/yIBb1X6uQxDwt0Xptvs6c="
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/tiny-inflate/-/tiny-inflate-1.0.3.tgz",
+      "integrity": "sha512-pkY1fj1cKHb2seWDy0B16HeWyczlJA9/WW3u3c4z/NiWDsO3DOU5D7nhTLE9CF0yXv/QZFY7sEJmj24dK+Rrqw=="
     },
     "tmp": {
       "version": "0.0.33",
@@ -2489,12 +3038,26 @@
         "os-tmpdir": "~1.0.2"
       }
     },
+    "to-regex-range": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
+      "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
+      "dev": true,
+      "requires": {
+        "is-number": "^7.0.0"
+      }
+    },
     "tslib": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
       "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
       "dev": true
     },
+    "type": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/type/-/type-1.2.0.tgz",
+      "integrity": "sha512-+5nt5AAniqsCnu2cEQQdpzCAh33kVx8n0VoFidKpB1dVVLAN/F+bgVOqOJqOnEnrhp222clB5p3vUlD+1QAnfg=="
+    },
     "type-check": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
@@ -2509,6 +3072,12 @@
       "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
       "dev": true
     },
+    "type-fest": {
+      "version": "0.8.1",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
+      "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
+      "dev": true
+    },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -2526,23 +3095,23 @@
       }
     },
     "underscore": {
-      "version": "1.9.1",
-      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.9.1.tgz",
-      "integrity": "sha512-5/4etnCkd9c8gwgowi5/om/mYO5ajCaOgdzj/oW+0eQV9WxKBDZw5+ycmKmeaTXjInS/W0BzpGLo2xR2aBwZdg=="
+      "version": "1.9.2",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.9.2.tgz",
+      "integrity": "sha512-D39qtimx0c1fI3ya1Lnhk3E9nONswSKhnffBI0gME9C99fYOkNi04xs8K6pePLhvl1frbDemkaBQ5ikWllR2HQ=="
     },
     "unicode-properties": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/unicode-properties/-/unicode-properties-1.2.2.tgz",
-      "integrity": "sha512-+WhsOj19c93rPymvnPnFisbgFzrI4LjTV8ejMcCCfwS0XhdllZB4NsMFiYb4xUmpn3+aj3PM40h+wlzoG7PCnQ==",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/unicode-properties/-/unicode-properties-1.3.1.tgz",
+      "integrity": "sha512-nIV3Tf3LcUEZttY/2g4ZJtGXhWwSkuLL+rCu0DIAMbjyVPj+8j5gNVz4T/sVbnQybIsd5SFGkPKg/756OY6jlA==",
       "requires": {
         "base64-js": "^1.3.0",
-        "unicode-trie": "^1.0.0"
+        "unicode-trie": "^2.0.0"
       },
       "dependencies": {
         "unicode-trie": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/unicode-trie/-/unicode-trie-1.0.0.tgz",
-          "integrity": "sha512-v5raLKsobbFbWLMoX9+bChts/VhPPj3XpkNr/HbqkirXR1DPk8eo9IYKyvk0MQZFkaoRsFj2Rmaqgi2rfAZYtA==",
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/unicode-trie/-/unicode-trie-2.0.0.tgz",
+          "integrity": "sha512-x7bc76x0bm4prf1VLg79uhAzKw8DVboClSN5VxJuQ+LKDOVEW9CdH+VY7SP+vX7xCYQqzzgQpFqz15zeLvAtZQ==",
           "requires": {
             "pako": "^0.2.5",
             "tiny-inflate": "^1.0.0"
@@ -2573,15 +3142,6 @@
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
-    "util.promisify": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
-      "integrity": "sha512-i+6qA2MPhvoKLuxnJNpXAGhg7HphQOSUq2LKMZD0m15EiskXUkMvKdF4Uui0WYeCUGea+o2cw/ZuwehtfsrNkA==",
-      "requires": {
-        "define-properties": "^1.1.2",
-        "object.getownpropertydescriptors": "^2.0.3"
-      }
-    },
     "v8-compile-cache": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
@@ -2625,8 +3185,47 @@
       "dev": true,
       "requires": {
         "string-width": "^1.0.2 || 2"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+          "dev": true
+        },
+        "string-width": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+          "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+          "dev": true,
+          "requires": {
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^4.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
+        }
       }
     },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -2643,6 +3242,18 @@
         "strip-ansi": "^5.0.0"
       },
       "dependencies": {
+        "emoji-regex": {
+          "version": "7.0.3",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+          "dev": true
+        },
         "string-width": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
@@ -2683,12 +3294,11 @@
       }
     },
     "xml2js": {
-      "version": "0.4.22",
-      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.22.tgz",
-      "integrity": "sha512-MWTbxAQqclRSTnehWWe5nMKzI3VmJ8ltiJEco8akcC6j3miOhjjfzKum5sId+CWhfxdOs/1xauYr8/ZDBtQiRw==",
+      "version": "0.4.23",
+      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.23.tgz",
+      "integrity": "sha512-ySPiMjM0+pLDftHgXY4By0uswI3SPKLDw/i3UXbnO8M/p28zqexCUoPmQFrYD+/1BzhGJSs2i1ERWKJAtiLrug==",
       "requires": {
         "sax": ">=0.6.0",
-        "util.promisify": "~1.0.0",
         "xmlbuilder": "~11.0.0"
       }
     },
@@ -2726,6 +3336,18 @@
         "yargs-parser": "^13.1.1"
       },
       "dependencies": {
+        "emoji-regex": {
+          "version": "7.0.3",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+          "dev": true
+        },
         "string-width": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
diff --git a/package.json b/package.json
index 2872d2e..1b85435 100644
--- a/package.json
+++ b/package.json
@@ -28,17 +28,17 @@
     "debug": "^4.1.1",
     "deep-clone-merge": "^1.4.0",
     "hogan.js": "^3.0.2",
-    "pdfkit": "^0.10.0",
-    "underscore": "^1.8.2",
-    "xml2js": "^0.4.22"
+    "pdfkit": "^0.11.0",
+    "underscore": "^1.9.2",
+    "xml2js": "^0.4.23"
   },
   "devDependencies": {
     "chai": "^4.2.0",
-    "eslint": "^6.5.1",
+    "eslint": "^6.8.0",
     "istanbul": "^0.4.3",
-    "mocha": "^6.2.1",
+    "mocha": "^7.0.1",
     "npm-run-all": "^4.0.2",
-    "sinon": "^7.5.0",
-    "sinon-chai": "^3.3.0"
+    "sinon": "^8.1.1",
+    "sinon-chai": "^3.4.0"
   }
 }
diff --git a/test/unit/fixtures/example.pdf b/test/unit/fixtures/example.pdf
index ea8730e..703c77d 100644
Binary files a/test/unit/fixtures/example.pdf and b/test/unit/fixtures/example.pdf differ
diff --git a/test/unit/lib/spec.generate.js b/test/unit/lib/spec.generate.js
index 648ec3d..a9a431c 100644
--- a/test/unit/lib/spec.generate.js
+++ b/test/unit/lib/spec.generate.js
@@ -174,7 +174,7 @@ describe('generate', () => {
         let xml = fs.readFileSync(sourcefilename);
         generate.toBuffer(xml, path.dirname(sourcefilename), (err, buffer) => {
             expect(err).to.be.null;
-            fs.writeFileSync(examplepdf, buffer);
+            // fs.writeFileSync(examplepdf, buffer);
             let pdf = fs.readFileSync(examplepdf);
             buffer.byteLength.should.equal(pdf.byteLength);
             done();