update tap, test on node 16

Author: isaacs

Diff for: .github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [10.x, 12.x, 14.x]
+        node-version: [10.x, 12.x, 14.x, 16.x]
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     runs-on: ${{ matrix.os }}