Add github workflow

Author: taylorhakes

.github/workflows/tests.yml

@@ -0,0 +1,24 @@
+name: Node CI
+
+on: [push, pull_request]
+
+jobs:  
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [12.x, 14.x, 16.x]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: npm install, build, and test
+      run: |
+        npm test
+      env:
+        CI: true

README.md

@@ -1,10 +1,5 @@
 # Promise Polyfill
 
-[![travis][travis-image]][travis-url]
-
-[travis-image]: https://img.shields.io/travis/taylorhakes/promise-polyfill.svg?style=flat
-[travis-url]: https://travis-ci.org/taylorhakes/promise-polyfill
-
 Lightweight ES6 Promise polyfill for the browser and node. Adheres closely to
 the spec. It is a perfect polyfill IE or any other browser that does
 not support native promises.