update changelog

Author: aritchie

docs/changelog.md

@@ -4,6 +4,7 @@
 * [droid][fix] icon not appearing in bottom sheet dialog
 * [uwp][fix] vertically center progress dialog
 * [uwp][feature] ability to set custom dispatcher via Init(Action<Action> customUiDispatcher) - good for kiosk mode
+* [uwp][feature] ability to cancel dialogs with ESC key or submit via ENTER
 
 ## 7.0.1
 * [feature] Tizen!