update rel-notes

Author: Jens Kürten

docs/release_notes.md

@@ -3,7 +3,8 @@ Breaking changes:
 - Changed the names of the events and their classes, to be more consistent:
   - `DocumentReleaseEvent` -> `DocumentReleasedEvent`
   - `PartReleaseEvent` -> `PartReleasedEvent`
-  - `EngineeringChangeReleaseEvent` -> `EngineeringChangeReleasedEvent`
+  - `EngineeringChangeRelease` -> `EngineeringChangeReleasedEvent`
+  - `EngineeringChangeCheck`> `EngineeringChangeCheckEvent`
 
 - Event data now consistently uses the attributes `parts` and `documents` instead of `linked_parts` or `attached_parts`