Update RELEASE_NOTES.md

added the UI/UX change

Author: MStraeten

RELEASE_NOTES.md

@@ -77,6 +77,7 @@ changes (where available).
 
 - Added the standard "Window" menu to the application menu bar on
   macOS.
+- Moved controls for mask exposure and contrast compensation to the advanced tab.
 
 - In the navigation windows, the zoom is now better behaving. After a
   free zoom over the darkroom, using the scroll over the zoom level