Changelog: Version 1.6.7

Had this version ready for a while, but got caught on some personnal stuff and never got the time to post it. So let's fix this now!

Version 1.6.7:

• Fixed a bug that would cause categories added after a save file not to be recognized by the plugin when the game was loaded, and a book in that category was marked as read.
• Added compatibility with the engine encrypt images feature for both MV and MZ.