Mention `black` or `ruff` in the craftsmanship lecture?

* [Python black](https://www.geeksforgeeks.org/python-code-formatting-using-black/) is a great automation tool for a lot of this stuff. Might as well mention it.
* [Python ruff](https://github.com/charliermarsh/ruff) is a more standard linting tool. But it's very new.