Added
- ENH: add structural to total mass ratio for motor and rocket [713](https://github.com/RocketPy-Team/RocketPy/pull/713)
Changed
- REL: bumps up rocketpy version to v1.6.2 [724](https://github.com/RocketPy-Team/RocketPy/pull/724)
Fixed
- BUG: fix export ellipses to kml function [712](https://github.com/RocketPy-Team/RocketPy/pull/712)