What's Changed
* Update .readthedocs.yaml to resolve build error by himoto in https://github.com/biomass-dev/biomass/pull/255
* Use default ddof(=0) by himoto in https://github.com/biomass-dev/biomass/pull/256
* Remove unused variable: ` __version__` by himoto in https://github.com/biomass-dev/biomass/pull/257
* Don't use Sphinx version 7 or more by himoto in https://github.com/biomass-dev/biomass/pull/259
* Fix pepy badge by himoto in https://github.com/biomass-dev/biomass/pull/263
* Remove Sphinx version constraints by himoto in https://github.com/biomass-dev/biomass/pull/262
* Specify minimal `sphinx-rtd-theme` version by himoto in https://github.com/biomass-dev/biomass/pull/264
* Update MANIFEST.in by himoto in https://github.com/biomass-dev/biomass/pull/266
* Update citation infomation by himoto in https://github.com/biomass-dev/biomass/pull/267
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/biomass-dev/biomass/pull/260
**Full Changelog**: https://github.com/biomass-dev/biomass/compare/v0.12.0...v0.13.0