Test on Node 20 (#595)

Author: bmish

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu, windows ]
-        node-version: [12.x, 14.x, 16.x, 17.x, 18.x, 19.x]
+        node-version: [12.x, 14.x, 16.x, 17.x, 18.x, 19.x, 20.x]
 
     steps:
     - uses: actions/checkout@v3