Merge pull request #548 from maspwr/master

Remove duplicate release notes line

docs/topics/release-notes.md

@@ -22,7 +22,6 @@ Major version numbers (x.0.0) are reserved for project milestones.  No major poi
 
 * Added `PATCH` support.
 * Added `RetrieveUpdateAPIView`.
-* Relation changes are now persisted in `save` instead of in `.restore_object`.
 * Remove unused internal `save_m2m` flag on `ModelSerializer.save()`.
 * Tweak behavior of hyperlinked fields with an explicit format suffix.
 * Relation changes are now persisted in `.save()` instead of in `.restore_object()`.