Adding changelog item

Modules/Core/changelog.yml

@@ -9,6 +9,7 @@ versions:
             - CkEditor and SimpleMde hooks set a view variable containing their name
             - Refactoring the .env local file writer
             - Tell users about the -f force flag for the asgard installer
+            - Update the message displayed while the admin user is created.
     "3.0.0":
         added:
             - Created a vue component for the delete buttons on index pages