Bill

## Summary (documentation) This is an extremely helpful tool that can be used in loads of contexts! One context that I've been using it in is as an [additional dependency](https://pre-commit.com/#config-additional_dependencies)...

### Checklist - [x] This is a new feature, not a refactoring suggestion - [x] I have checked for this feature in the [Sourcery documentation](https://docs.sourcery.ai/) - [x] I have checked...