test on NodeJS 16

Author: delabiejochen

.github/workflows/test.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: 16.x
+        node-version: '16.x'
     steps:
       - name: Clone Repository
         uses: actions/checkout@v2