v2.1.0+1 - Undo hotfixes

Hi, quick hotfix release! This release fixes some bugs in the new undo implementation, and it is highly recommended that all v2.1.0 users upgrade immediately! It also restricts undos to 7 days from the confession creation date.

What's Changed

• Improvements to undo + support for old handler callback format by @Merlin04 in #89

Full Changelog: v2.1.0...v2.1.0+1