Update 1.2.0.md

Author: punker76

docs/release-notes/1.2.0.md

@@ -102,6 +102,8 @@ This is a bug fix and feature release of MahApps.Metro v1.2.0.
 - Use a `Thumb` for Window DragMove #2226
 - `ComboBox` style respects textbox helper button content property #2264 (@ButchersBoy)
 - Show `Tile` as disabled #2263 #2262 (@xxMUROxx)
+- New dependency property `CloseButtonIsCancel` for `Flyout` close button #2256 (@BlythMeister)
+- New property `DefaultButtonFocus` for default focused button in MessageDialog #2265 (@BlythMeister)
 
 # Bugfixes