Update release notes

Author: dotMorten

src/WinUIEx/WinUIEx.csproj

@@ -26,6 +26,10 @@
     <Product>WinUI Extensions</Product>
     <PackageReleaseNotes>
         - Added a new analyzer to call out when an invalid type is passed to `Frame.Navigate`. #260
+        - Remove obsolete tags from WebAuthenticator.
+        - Improve location of tray flyout to not obscure icon.
+        - Obsolete Icon class in favor of WinAppSDK's AppWindow.SetIcon.
+        - Fix ToggleWindowStyle not always working #249 
     </PackageReleaseNotes>
   </PropertyGroup>