Highlights
* Adds `Ag3.fst_gwss()` and `Ag3.plot_fst_gwss()` functions for calculating and plotting Fst across a contig.
What's Changed
* Implement plot_fst_gwss function by sanjaynagi in https://github.com/malariagen/malariagen-data-python/pull/294
* Fix docstrings by alimanfoo in https://github.com/malariagen/malariagen-data-python/pull/304
**Full Changelog**: https://github.com/malariagen/malariagen-data-python/compare/v7.0.5...v7.1.0