Add CI

.github/workflows/main.yml

@@ -0,0 +1,35 @@
+name: build
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+  workflow_dispatch:
+
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x, 16.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v2
+      with:
+        node-version: ${{ matrix.node-version }}
+
+    - run: npm i
+    - run: npm link
+    - run: npm link recache
+    - run: npm run check
+    - run: npm run test-lcov
+
+    - name: Coveralls GitHub Action
+      uses: coverallsapp/github-action@v1.1.2
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}