drop tests for node 16 (#127)

Author: johannes-vogel

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]  # see https://nodejs.org/en/about/releases/
+        node-version: [18.x, 20.x]  # see https://nodejs.org/en/about/releases/
     steps:
     - uses: actions/checkout@v3
     - name: Use Node.js ${{ matrix.node-version }}