Remove node 10, it has reached EOL, add node 16 to get us ready for the next LTS.

Author: brendandburns

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [ '14', '12', '10' ]
+        node: [ '16', '14', '12' ]
     name: Node ${{ matrix.node }} validation
     steps:
       - uses: actions/checkout@v2