Use GH Actions as CI

Author: pioug

.github/workflows/push.yml

@@ -0,0 +1,15 @@
+on: push
+name: Run tests
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: ['10', '12', '14']
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm ci
+      - run: npm test