chore: move CI to GitHub actions

.github/workflows/nodejs.yml

@@ -0,0 +1,28 @@
+name: Node.js CI
+
+on:
+  push:
+    branches: master
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: npm install and test
+        run: |
+          npm install
+          npm run test
+      - name: verify that the the build works
+        run: |
+          npm run build
+          node dist/ml.js
+          node dist/ml.min.js