Update npm.yml

Author: mrholek

.github/workflows/npm.yml

@@ -12,18 +12,20 @@ env:
   NODE: 16
 
 jobs:
-  run:
-    name: NPM Installation
-    runs-on: ubuntu-latest
-
+  build:
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, windows-latest]
+        node-version: [12.x, 14.x, 16.x, 17.x]
+    runs-on: ${{ matrix.platform }}
     steps:
       - name: Clone repository
         uses: actions/checkout@v3
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: ${{ env.NODE }}
+          node-version: ${{ env.node-version }}
 
       - name: Install npm dependencies
         run: npm install