Tad-multicharge

What's Changed
* Fix docs by marvinfriede in https://github.com/tad-mctc/tad-multicharge/pull/3
* Refactor typing by marvinfriede in https://github.com/tad-mctc/tad-multicharge/pull/4
* Bump version to 0.0.2 by marvinfriede in https://github.com/tad-mctc/tad-multicharge/pull/5


**Full Changelog**: https://github.com/tad-mctc/tad-multicharge/compare/v0.0.1...v0.0.2

The initial release contains the (non-periodic) implementation of the EEQ charge model (including actinides).