`moviepy 2.0.0` breaks `animate_molcloud` imports

[moviepy 2.0.0](https://github.com/Zulko/moviepy) was released a few days ago and the current imports for `animate_molcloud` break due to the changes. Could pin version to `<2.0.0`.

```python
ModuleNotFoundError: No module named 'moviepy.editor'
```