Optional-dependencies

What's Changed
* docs: update codecov badge by nstarman in https://github.com/GalacticDynamics/optional_dependencies/pull/13
* docs: small fixes by nstarman in https://github.com/GalacticDynamics/optional_dependencies/pull/14


**Full Changelog**: https://github.com/GalacticDynamics/optional_dependencies/compare/v0.3.1...v0.3.2

What's Changed
* docs: fix by nstarman in https://github.com/GalacticDynamics/optional_dependencies/pull/12


**Full Changelog**: https://github.com/GalacticDynamics/optional_dependencies/compare/v0.3.0...v0.3.1

What's Changed
* feat: rich comparison by nstarman in https://github.com/GalacticDynamics/optional_dependencies/pull/11


**Full Changelog**: https://github.com/GalacticDynamics/optional_dependencies/compare/v0.2.1...v0.3.0

What's Changed
* fix: `is_installed` by nstarman in https://github.com/GalacticDynamics/optional_dependencies/pull/10


**Full Changelog**: https://github.com/GalacticDynamics/optional_dependencies/compare/v0.2.0...v0.2.1

What's Changed
* feat: low-level API by nstarman in https://github.com/GalacticDynamics/optional_dependencies/pull/8
* docs: fix by nstarman in https://github.com/GalacticDynamics/optional_dependencies/pull/9


**Full Changelog**: https://github.com/GalacticDynamics/optional_dependencies/compare/v0.1.1...v0.2.0

What's Changed
* build: support python 13 by nstarman in https://github.com/GalacticDynamics/optional_dependencies/pull/7


**Full Changelog**: https://github.com/GalacticDynamics/optional_dependencies/compare/v0.1.0...v0.1.1