Update CI matrix to use version '1' instead of 'pre'

Author: DanielVandH

.github/workflows/CI.yml

@@ -27,7 +27,7 @@ jobs:
         version:
           - '1.10'
           - '1.8'
-          - 'pre'
+          - '1'
         os:
           - ubuntu-latest
           - windows-latest