chore: replace travis w/ github actions

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: lukeed

.github/workflows/ci.yml

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+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    name: Node.js v${{ matrix.nodejs }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        nodejs: [8, 10, 12]
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.nodejs }}
+
+    - name: (cache) restore
+      uses: actions/cache@master
+      with:
+        path: node_modules
+        key: ${{ runner.os }}-${{ hashFiles('**/package.json') }}
+
+    - name: Install
+      run: npm install
+
+    - name: (coverage) Install
+      if: matrix.nodejs >= 12
+      run: npm install -g nyc
+
+    - name: Test
+      run: npm test
+      if: matrix.nodejs < 12
+
+    - name: (coverage) Test
+      run: nyc --include=src npm test
+      if: matrix.nodejs >= 12
+
+    - name: (coverage) Report
+      if: matrix.nodejs >= 12
+      run: |
+        nyc report --reporter=text-lcov > coverage.lcov
+        bash <(curl -s https://codecov.io/bash)
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}