Add tests to be run on node.js v16

Author: jehna

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                node-version: ['15', '14', '13', '12', '11', '10']
+                node-version: ["16", "15", "14", "13", "12", "11", "10"]
         steps:
             - uses: actions/checkout@v2
             - uses: actions/setup-node@v1