Patch
What's fixed:
- Crash when trying to edit 6x6 sudoku
- Generating difficulty (Related to #31)
- Wrong row/col of initial digits in saved game screen, resulting in some initial digits to be colored as entered by user (#32)
- Attempt to enter a number in a locked cell can be undone (#33)
Full Changelog: v1.4.0...v1.4.1