Update rollup-plugin-md for security alerts and modern build

.github/workflows/nodejs.yml

@@ -0,0 +1,31 @@
+name: Node.js CI
+
+on:
+  push:
+    branches:
+      - '*'
+    tags-ignore:
+      - 'v*'
+    paths-ignore:
+      - 'docs/**'
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [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 }}
+    - run: npm install
+    - run: npm run build --if-present
+    - run: npm test
+      env:
+        CI: true