document new release notes flow
concourse/concourse#4312
+#### <sub><sup><a name="v550-note-1" href="#v550-note-1">:link:</a></sup></sub> feature
+
+We have changed our release notes flow! Now, contributors can add draft release notes right in their PRs, by modifying the `release-notes/latest.md` file in the `concourse/concourse` repo.
