v5.7.0

v5.7.0 (minor)

Changes since v5.6.0:

• Add KilometerPerSecond, the unit orbital state vectors are quoted in (@Claude)

What's Changed

• Add KilometerPerSecond, the unit orbital state vectors are quoted in by @matt-edmondson in #275

Full Changelog: v5.6.0...v5.7.0