github workflow

.github/workflows/main.yml

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+name: Coveralls
+
+on: ["push", "pull_request"]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js 15.x
+        uses: actions/setup-node@v2
+        with:
+          node-version: 15.x
+      - name: yarn, compile, hint, coverage
+        run: |
+          yarn
+          yarn compile
+          yarn hint
+          yarn coverage
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}