ci: unit test node 16 (OpenFunction#389)

- Unit test Node 16 - Use simple syntax like the docs: https://github.com/actions/setup-node

Author: grant

.github/workflows/unit.yml

@@ -8,7 +8,7 @@ jobs:
  test:
  strategy:
  matrix:
- node-version: [10.x, 12.x, 14.x]
+ node-version: [10, 12, 14, 16]
  platform: [ubuntu-latest, macos-latest, windows-latest]
  runs-on: ${{ matrix.platform }}
  steps: