Drupal 9 readiness

Patch is ok.
Additional scan result from Upgrade Status:

FILE: modules/d9/admin_content_notification/composer.json

STATUS         LINE                           MESSAGE                           
--------------------------------------------------------------------------------
Check manually 0    The drupal/core requirement is not Drupal 9 compatible.     
                    Either remove it or update it to be compatible with Drupal  
                    9. See                                                      
                    https://drupal.org/node/2514612#s-drupal-9-compatibility.   
--------------------------------------------------------------------------------

So is this D9 ready please ? if so why not committed yet !
Thanks

I downloaded and installed the module manually after applying the patch and I confirm it installs and config without errors on D9.01.
I haven't tested its functionality yet.

Tested on production D9 and all working fine except for the inconvenient CC of all emails recipients instead of BCC !!!