fixed markdown error on CHANGES.md

Author: alejcas

CHANGES.md

@@ -4,7 +4,7 @@ Almost every release features a lot of bugfixes but those are not listed here.
 
 ## Version 2.1.0 (2025-02-13)
 
-[!IMPORTANT]
+> [!IMPORTANT]
 > Removed custom authentication in favour of msal. Old tokens will not work with this version and will require a new authentication flow.
 
 - Account: you can now work with multiple users by changing `account.username` when using auth flow type authorization.