Recursive dependees

[hasier]

What has changed? This should match CHANGELOG.md.

While working on https://github.com/jacksmith15/poetry-workspace-plugin/pull/6 I found this tiny edge case, thought it might be interesting to include before any other major changes.

Check list

Before asking for a review

• [x] Target branch is master
• [x] [Unreleased] section in CHANGELOG.md is updated.
• [x] I reviewed the "Files changed" tab and self-annotated anything unexpected.

Before review (reviewer)

• [ ] All of the above are checked and true. Review ALL items. If not, return the PR to the author.
• [ ] Continuous Integration is passing. If not, return the PR to the author.

After merge (reviewer)

• [ ] Any issues that may now be closed are closed.