Update ci.yml

remove nightly testing

Author: arturgower

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
         version:
           - '1.5' # Replace this with the minimum Julia version that your package supports. E.g. if your package requires Julia 1.5 or higher, change this to '1.5'.
           - '1.6' # Leave this line unchanged. '1' will automatically expand to the latest stable 1.x release of Julia.
-          - 'nightly'
+          # - 'nightly'
         os:
           - ubuntu-latest
         arch: