Run workflow on push and pull_request.

Format YAML with prettier.

Author: blueimp

.github/workflows/nodejs.yml

@@ -1,26 +1,25 @@
 name: Node CI
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
         node-version: [8.x, 10.x, 12.x]
 
     steps:
-    - uses: actions/checkout@v1
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
-      with:
-        node-version: ${{ matrix.node-version }}
-    - name: npm install, build, and test
-      run: |
-        npm install
-        npm run build --if-present
-        npm test
-      env:
-        CI: true
+      - uses: actions/checkout@v1
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: npm install, build, and test
+        run: |
+          npm install
+          npm run build --if-present
+          npm test
+        env:
+          CI: true