Do not change two different things in one Pull Request

A Pull Request should only address one change at a time.

Reviewers might not have an in-depth understanding of how things relate to each other in a project so do not mix conceptually different changes in one PR.

Some examples of what not to do:

• fix a bug AND update all dependencies. If a bug fix requires a new dependency or an update to one, then only add this single dependency change.
• implement a new feature AND fix a small bug on an unrelated file. Those should be two PRs.