v0.2.1

Mostly minor bug fixing to deal with indexing proglem

What's Changed

• pip prod(deps): update readthedocs-sphinx-ext requirement from <=2.2.2 to <=2.2.3 by @dependabot in #44
• Update README.rst by @zktuong in #45
• fix duplicate rownames introduced in cellphonedb v5 by @zktuong in #48
• pip prod(deps): update sphinx-rtd-theme requirement from <=1.3.0 to <=2.0.0 by @dependabot in #47

Full Changelog: v0.2.0...v0.2.1