Update release notes

Signed-off-by: Elzbieta Kotulska <[email protected]>

Author: ela-kotulska-frequenz

RELEASE_NOTES.md

@@ -2,5 +2,7 @@
 
 ## Bug Fixes
 
-* Fix bug with `LoggingConfigUpdater` not updating root logger level.
-* The `frequenz-quantities` dependency requirement was widened to allow any v1.x version (it was pinned to `1.0.0rc3` before).
+* Fix bugs with `ConfigManagingActor`:
+  - Raising unhandled exceptions when any file in config directory was deleted.
+  - Raising unhandled exception if not all config files exist.
+  - Losing all file notify events when actor restarts after crash.