Switch to github actions. Remove travis and appveyor builds and badges.

.github/workflows/node.js.yml

@@ -0,0 +1,25 @@
+name: Node.js CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        node-version: [10.x, 12.x, 14.x, 15.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: yarn ci
+    - run: yarn test

README.md

@@ -3,8 +3,7 @@
 **Fast, cross-platform [Node.js](https://nodejs.org/) access to [ExifTool](https://exiftool.org/).**
 
 [![npm version](https://img.shields.io/npm/v/exiftool-vendored.svg)](https://www.npmjs.com/package/exiftool-vendored)
-[![Build status](https://travis-ci.org/photostructure/exiftool-vendored.js.svg?branch=master)](https://travis-ci.org/photostructure/exiftool-vendored.js)
-[![Build status](https://ci.appveyor.com/api/projects/status/g5pfma7owvtsrrkm/branch/master?svg=true)](https://ci.appveyor.com/project/mceachen/exiftool-vendored/branch/master)
+[![CI](https://github.com/photostructure/exiftool-vendored.js/workflows/Node.js%20CI/badge.svg?branch=master)](https://github.com/photostructure/exiftool-vendored.js/actions?query=workflow%3A%22Node.js+CI%22)
 [![GitHub issues](https://img.shields.io/github/issues/photostructure/exiftool-vendored.js.svg)](https://github.com/photostructure/exiftool-vendored.js/issues)
 [![Language grade: JavaScript](https://img.shields.io/lgtm/grade/javascript/g/photostructure/exiftool-vendored.js.svg)](https://lgtm.com/projects/g/photostructure/exiftool-vendored.js/context:javascript)
 [![Known Vulnerabilities](https://snyk.io/test/github/photostructure/exiftool-vendored.js/badge.svg?targetFile=package.json)](https://snyk.io/test/github/photostructure/exiftool-vendored.js?targetFile=package.json)

package.json

@@ -9,6 +9,7 @@
     "url": "https://github.com/photostructure/exiftool-vendored.js/issues"
   },
   "scripts": {
+    "ci": "yarn install --frozen-lockfile",
     "clean": "rimraf lib dist coverage .nyc_output",
     "precompile": "yarn clean",
     "compile": "tsc",