What's Changed
* `ThirdOrderDeformation`: Set inactive derivatives to `None` by adtzlr in https://github.com/adtzlr/hyperelastic/pull/12
* Add Sphinx Docs by adtzlr in https://github.com/adtzlr/hyperelastic/pull/13
* Enhance the performance of `cdya(A, B)` by adtzlr in https://github.com/adtzlr/hyperelastic/pull/16
**Full Changelog**: https://github.com/adtzlr/hyperelastic/compare/v0.3.0...v0.4.0