Switch from Travis CI to Github Actions (#200)

Author: addaleax

.github/workflows/nodejs.yml

@@ -0,0 +1,23 @@
+on: [push, pull_request]
+
+name: CI
+
+jobs:
+  test:
+    name: Test
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        node-version: [12.x, 14.x]
+    runs-on: ${{matrix.os}}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Install Dependencies
+        run: npm install
+      - name: Test
+        run: npm test