Phylox

- Rerelase because of failed pypi upload.

- Fixed main example from the documentation. (42)
- Cleaned up Heath network generator. (48)
- Added more context and description of PhyloX to the JOSS paper. (52)
- More robust Newick parser: allow empty properties. (55)
- Add docstrings for LGT generator and for from_cherry_picking_sequence. (60)
- Fix and test Newick input for HybridizationProblem. (61)
- Fix bug in HybridizationProblem with lengths due to caching and degree-2 roots. (62)

Changed

- ReadTheDocs requirements, so that it builds again.

Changed

- Github action for pypi release

Changed

- Version number, for first official release