Update nodejs.yml

.github/workflows/nodejs.yml

@@ -9,11 +9,10 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    
-  strategy:
-    matrix:
-      node-version: [12.x]
-
+    strategy:
+      matrix:
+        node-version: [12.x]
+        
     steps:
     - uses: actions/checkout@v1
     - name: Use latest Node.js