Switch to GitHub Actions CI. (#103)

.github/workflows/ci.yml

@@ -0,0 +1,50 @@
+name: CI
+
+on:
+  - push
+  - pull_request
+
+env:
+  FORCE_COLOR: 2
+
+jobs:
+  test:
+    name: Node ${{ matrix.node }}
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        node: [10, 12, 14, 16]
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: Install npm dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+  publish:
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 14
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Publish on npm
+        run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}