Move from Travis CI to GitHub Actions.

.github/workflows/ci.yml

@@ -0,0 +1,60 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version:
+          -  4.x
+          -  6.x
+          -  6.0
+          -  7.x
+          -  8.x
+          -  9.x
+          - 10.0
+          - 10.x
+          - 11.0
+          - 11.x
+          - 12.0
+          - 12.x
+          - 13.0
+          - 13.x
+          - 14.0
+          - 14.x
+          - 15.0
+          - 15.x
+    steps:
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - uses: actions/checkout@v2
+      - run: npm install
+      - if: ${{ matrix.node-version == '4.x' }}
+        run: npm install mocha@5.0.0 eslint@4.19.1 esquery@1.0.0 nyc@11.8.0
+      - run: node_modules/.bin/nyc --reporter=text-lcov node_modules/.bin/mocha | tee lcov.info
+      - uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.github_token }}
+          flag-name: run-${{ matrix.node-version }}
+          parallel: true
+          path-to-lcov: lcov.info
+
+  coveralls:
+    needs: test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Consolidate test coverage from different jobs
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.github_token }}
+          parallel-finished: true