Bump superagent from 3.8.2 to 3.8.3

Bumps [superagent](https://github.com/visionmedia/superagent) from 3.8.2 to 3.8.3.
- [Release notes](https://github.com/visionmedia/superagent/releases)
- [Changelog](https://github.com/visionmedia/superagent/blob/master/History.md)
- [Commits](ladjs/superagent@v3.8.2...v3.8.3)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -51,7 +51,7 @@
     "pump": "^3.0.0",
     "raven": "^2.6.4",
     "stream-each": "^1.2.3",
-    "superagent": "^3.5.2",
+    "superagent": "^3.8.3",
     "through2": "^2.0.3",
     "tldjs": "^2.0.0",
     "underscore.string": "^3.3",

yarn.lock

@@ -3659,7 +3659,7 @@ form-data@^2.3.1, form-data@~2.3.1, form-data@~2.3.2:
     combined-stream "1.0.6"
     mime-types "^2.1.12"
 
-formidable@^1.1.1:
+formidable@^1.2.0:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/formidable/-/formidable-1.2.1.tgz#70fb7ca0290ee6ff961090415f4b3df3d2082659"
   integrity sha512-Fs9VRguL0gqGHkXS5GQiMCr1VhZBxz0JnJs4JmMp/2jL18Fmbzvv7vOFRU+U8TBkHEE/CX1qDXzJplVULgsLeg==
@@ -8059,21 +8059,21 @@ stylus@0.54.5, stylus@~0.54.5:
     sax "0.5.x"
     source-map "0.1.x"
 
-superagent@^3.5.2:
-  version "3.8.2"
-  resolved "https://registry.yarnpkg.com/superagent/-/superagent-3.8.2.tgz#e4a11b9d047f7d3efeb3bbe536d9ec0021d16403"
-  integrity sha512-gVH4QfYHcY3P0f/BZzavLreHW3T1v7hG9B+hpMQotGQqurOvhv87GcMCd6LWySmBuf+BDR44TQd0aISjVHLeNQ==
+superagent@^3.8.3:
+  version "3.8.3"
+  resolved "https://registry.yarnpkg.com/superagent/-/superagent-3.8.3.tgz#460ea0dbdb7d5b11bc4f78deba565f86a178e128"
+  integrity sha512-GLQtLMCoEIK4eDv6OGtkOoSMt3D+oq0y3dsxMuYuDvaNUvuT8eFBuLmfR0iYYzHC1e8hpzC6ZsxbuP6DIalMFA==
   dependencies:
     component-emitter "^1.2.0"
     cookiejar "^2.1.0"
     debug "^3.1.0"
     extend "^3.0.0"
     form-data "^2.3.1"
-    formidable "^1.1.1"
+    formidable "^1.2.0"
     methods "^1.1.1"
     mime "^1.4.1"
     qs "^6.5.1"
-    readable-stream "^2.0.5"
+    readable-stream "^2.3.5"
 
 supports-color@^2.0.0:
   version "2.0.0"