ci(): add node v16

Author: kamilmysliwiec

.github/workflows/continuous-integration-workflow.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: ['10.x', '12.x', '14.x']
+        node-version: ['10.x', '12.x', '14.x', '16.x']
       fail-fast: false
     steps:
       - uses: actions/checkout@v2