tests: setup GitHub Actions to replace Travis (#1497)

Additionally adds testing against many Node.js versions and Redis versions.

.github/workflows/benchmark.yml

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+name: Benchmarking
+
+on: [pull_request]
+
+jobs:
+  benchmark:
+    name: Benchmark
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [8.x, 10.x, 12.x]
+        redis-version: [5]
+
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Setup Redis
+        uses: shogo82148/actions-setup-redis@v1.0.1
+        with:
+          redis-version: ${{ matrix.redis-version }}
+          auto-start: "true"
+
+      - run: npm i --no-audit --prefer-offline
+      - name: Run Benchmark
+        run: npm run benchmark > benchmark-output.txt && cat benchmark-output.txt
+      - name: Upload Benchmark Result
+        uses: actions/upload-artifact@v1
+        with:
+          name: benchmark-output.txt
+          path: benchmark-output.txt

.github/workflows/linting.yml

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+name: Linting
+
+on: [pull_request]
+
+jobs:
+  eslint:
+    name: ESLint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - run: npm i --no-audit --prefer-offline
+      - name: Test Code Linting
+        run: npm run lint
+      - name: Save Code Linting Report JSON
+        run: npm run lint:report
+        continue-on-error: true
+      - name: Annotate Code Linting Results
+        uses: ataylorme/eslint-annotate-action@1.0.4
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          report-json: "eslint-report.json"
+      - name: Upload ESLint report
+        uses: actions/upload-artifact@v1
+        with:
+          name: eslint-report.json
+          path: eslint-report.json

.github/workflows/tests.yml

@@ -0,0 +1,52 @@
+name: Tests
+
+on: [pull_request]
+
+jobs:
+  testing:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [6.x, 8.x, 10.x, 12.x]
+        redis-version: [4.x, 5.x]
+
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Setup Redis
+        uses: shogo82148/actions-setup-redis@v1.0.1
+        with:
+          redis-version: ${{ matrix.redis-version }}
+          auto-start: "false"
+
+      - name: Disable IPv6
+        run: sudo sh -c 'echo 0 > /proc/sys/net/ipv6/conf/all/disable_ipv6';
+
+      - name: Setup Stunnel
+        run: sudo apt-get install stunnel4
+
+      - name: Install Packages
+        run: npm i --no-audit --prefer-offline
+
+      - name: Run Tests
+        run: npm test
+
+      - name: Submit Coverage
+        run: npm run coveralls
+        env:
+          COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_TOKEN }}
+
+      - name: Upload Coverage Report
+        uses: actions/upload-artifact@v1
+        with:
+          name: coverage
+          path: coverage

.github/workflows/tests_windows.yml

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+name: Tests Windows
+
+on: [pull_request]
+
+jobs:
+  testing-windows:
+    name: Test Windows
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [6.x, 8.x, 10.x, 12.x]
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+
+      - name: Install Redis
+        uses: crazy-max/ghaction-chocolatey@v1
+        with:
+          args: install redis-64 --no-progress
+
+      - name: Start Redis
+        run: |
+          redis-server --service-install
+          redis-server --service-start
+          redis-cli config set stop-writes-on-bgsave-error no
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install Packages
+        run: npm i --no-audit --prefer-offline
+
+      - name: Run Tests
+        run: npm test
+
+      - name: Submit Coverage
+        run: npm run coveralls
+        env:
+          COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_TOKEN }}
+
+      - name: Upload Coverage Report
+        uses: actions/upload-artifact@v1
+        with:
+          name: coverage
+          path: coverage