Update CI.yml to 1.11 release, add nightly

Author: NHDaly

.github/workflows/CI.yml

@@ -21,7 +21,8 @@ jobs:
           - '1.8'
           - '1.9'
           - '1.10'
-          - '^1.11.0-beta2'
+          - '1.11'
+          - 'nightly'
         os:
           - ubuntu-latest
           - windows-latest