Thanks for contributing to manim!

**Please ensure that your pull request works with the latest version of manim.**
You should also include:

1. The motivation for making this change (or link the relevant issues)
2. How you tested the new behavior (e.g. a minimal working example, before/after
screenshots, gifs, commands, etc.) This is rather informal at the moment, but
the goal is to show us how you know the pull request works as intended.
