ci: test on node 14 and 16 (#140)

Author: alexander-akait

.github/workflows/nodejs.yml

@@ -62,7 +62,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [10.x, 12.x, 13.x]
+        node-version: [10.x, 12.x, 14.x, 16.x]
 
     runs-on: ${{ matrix.os }}