Add Node 20 to CI matrix.

Author: DavidAnson

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ macos-latest, ubuntu-latest, windows-latest ]
-        node-version: [ 14, 16, 18 ]
+        node-version: [ 14, 16, 18, 20 ]
 
     steps:
     - uses: actions/checkout@v3