Remove the testing matrix (#82)

We're just using 14.x anyway, and it screwed up the Github checks

Author: mofojed

.github/workflows/node.js.yml

@@ -13,17 +13,13 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        node-version: [14.x]
-
     steps:
       - uses: actions/checkout@v2
 
-      - name: Use Node.js ${{ matrix.node-version }}
+      - name: Use Node.js
         uses: actions/setup-node@v2
         with:
-          node-version: ${{ matrix.node-version }}
+          node-version: '14.x'
 
       - name: Cache node_modules
         id: cache-node-modules