What's Changed
* GHA, Black bump, Optional -> Union[..., None] by FBruzzesi in https://github.com/FBruzzesi/compclasses/pull/9
* Fix typos by FBruzzesi in https://github.com/FBruzzesi/compclasses/pull/15
* Move to ruff and hatch, add gha by FBruzzesi in https://github.com/FBruzzesi/compclasses/pull/17
**Full Changelog**: https://github.com/FBruzzesi/compclasses/compare/0.4.0...v0.4.2