Update Rocket.py

[FranzYuri]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (python setup.py install) was run locally and any changes were pushed
• Lint (black rocketpy) has passed locally and any fixes were made for failures
• All tests (pytest --runslow) have passed locally

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

RocketPy's code did not have any unit tests setup.

What is the new behavior?

Does this introduce a breaking change?

• Yes
• No

Other information