Edit release notes.

Author: michael-rapp

RELEASE_NOTES.md

@@ -4,6 +4,13 @@
 
 A bugfix release, which fixes the following issues:
 
+- The enable states of a `ListDialog`'s list items are now properly restored after orientation changes.
+- The listeners that are notified when a `ListDialog`'s list items are clicked are not reset after orientation changes.
+
+## Version 5.2.1 (Dec. 29th 2019)
+
+A bugfix release, which fixes the following issues:
+
 - The icons of a `ListDialog`'s list items are now properly restored after orientation changes.
 
 ## Version 5.2.0 (Dec. 28th 2019)