add node versions to Guthub actions

Author: josiasmontag

.github/workflows/run-tests.yml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 15.x, 16.x, 17.x, 18.x]
+        node-version: [14.x, 15.x, 16.x, 17.x, 18.x, 19.x, 20.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps: