v0.3.0 - Don't move the cursor

After working on my other idle extension idlealign, I've found there are much better ways to modify lines than going to a particular line and then getting currently selected line. Instead, you can just get whatever line you want directly and don't have to move the user's cursor. Other than that, this version reworks the way it handles searching for the next lint comment and cleans up a lot of other smaller details. Added a few missing type annotations. Added slots to Reporter class. Also, changing pypi version up to Beta because I think things are getting more stable.

Full Changelog: v0.2.3...v0.3.0