v1.2.1

This release adds back the 20px, 40px, and 60px sizes for Icon-Notification, Icon-Notification@2x, and Icon-Notification@3x.

@maggo opened an issue to remove these since the tables at https://developer.apple.com/library/content/qa/qa1686/_index.html don't list these icons. It appears to be a mistake, however, because the diagrams below those tables display the notification sizes for iPhone and iPad notifications. Thanks a lot Apple 🙃 .

Thanks for pointing it out @staticdreams.