What's Changed
* feat: parse to_units with unitsystem by nstarman in https://github.com/GalacticDynamics/coordinax/pull/77
* docs: correct unxt.AbstractUnitSystem by nstarman in https://github.com/GalacticDynamics/coordinax/pull/78
* feat: use Distance by nstarman in https://github.com/GalacticDynamics/coordinax/pull/79
* feat: additional spherical representations by nstarman in https://github.com/GalacticDynamics/coordinax/pull/80
**Full Changelog**: https://github.com/GalacticDynamics/coordinax/compare/v0.3.1...v0.4