Migrate to Github Actions

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+      fail-fast: false
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js
+      uses: actions/setup-node@v1
+    - name: Build and Test
+      run: |
+        npm ci
+        npm run build
+        if [ "${{ runner.os }}" == "Windows" ]; then
+          npm test
+        elif [ "${{ runner.os }}" == "macOS" ]; then
+          npm test --browsers chrome,safari
+        else
+          xvfb-run --auto-servernum npm test
+        fi
+      shell: bash