Replace Travis workflow with GitHub action

This keeps the existing matrix intact, but also adds node 14 and 16.

.github/workflows/test.yml

@@ -0,0 +1,36 @@
+# This workflow will do a clean install of node dependencies, cache/restore them, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: Test with coverage
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node: [10, 12, 14, 16]
+        hapi: ["@hapi/hapi@18", "@hapi/hapi@19", "@hapi/hapi@20"]
+        exclude:
+        - node: 10
+          hapi: "@hapi/hapi@19"
+        - node: 10
+          hapi: "@hapi/hapi@20"
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node }}
+      uses: actions/setup-node@v2
+      with:
+        node-version: ${{ matrix.node }}
+        cache: 'npm'
+    - run: npm ci
+    - run: npm install ${{ matrix.hapi }}
+    - run: npm run coveralls