Remove Node 12, add Node 16 to test matrix

Author: pioug

Diff for: .github/workflows/push.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: ['10', '12', '14']
+        node-version: ['12', '14', '16']
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1