v0.4.1

v0.4.1:

- Improvement: moved some functions from PencilDrawing to PencilStroke

v0.4.0

Refactored code, additional features, better testing

v0.2.2

Fixed bug in undo when controller is in erase mode

v0.2.0

See CHANGELOG.md

v0.1.0

Improved documentation and removal of unnecessary code

v0.0.1

Initial release