update 1.3.0.md

docs/release-notes/1.3.0.md

@@ -80,6 +80,9 @@ MahApps.Metro v1.3.0 bug fix and feature release.
 	+ It's now possible again to have title templates with clickable controls
 	+ Replaced `TitleCaps` with `TitleCharacterCasing` (marked as obsolete). Now title can be `Upper`, `Lower` or `Normal`
 	+ Add new styles `MahApps.Metro.Styles.ContentControlEx` and `MahApps.Metro.Styles.MetroThumbContentControl`
+- `Flyout` improvement caused by #2485 #2523
+	+ use `ContentControlEx` for header, so it's now possible to use `ControlsHelper` attached properties `ContentCharacterCasing`, `HeaderFontSize`, `HeaderFontWeight` and `HeaderFontStretch`
+	+ new attached property `ControlsHelper.HeaderMargin` to handle the Margin from Flyout side
 
 # Closed Issues
 
@@ -133,3 +136,4 @@ MahApps.Metro v1.3.0 bug fix and feature release.
 - #2495 Default for ControlsHelper.HeaderFontSizeProperty should be SystemFonts.MessageFontSize
 - #2479 DefaultButtonFocus Not Working As Expected PR #2505
 - #2514 NumericUpDown UseFloatingWatermark Issue
+- #2485 Hiding close button and title leaves blank space in top-positioned flyouts #2485