Update test workflow.

Author: blueimp

.github/workflows/test.yml

@@ -5,20 +5,16 @@ on: [push, pull_request]
 jobs:
   lint:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [14, 16]
     steps:
       - uses: actions/checkout@v2
-      - name: Setup Node.js
-        uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
-          node-version: 12.x
-      - name: npm install
-        run: npm install
-        env:
-          CI: true
-      - name: lint
-        run: npm run lint
-        env:
-          CI: true
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm run lint
 
   unit:
     runs-on: ubuntu-latest