Update README.md

Author: dotMorten

README.md

@@ -37,7 +37,7 @@ See here for details: https://github.com/sponsors/dotMorten
 
 ![numberbox](https://user-images.githubusercontent.com/1378165/75103965-70ea4980-55b7-11ea-843d-57dcc021053f.gif)
 
- - [RelativePanel](https://docs.microsoft.com/en-us/uwp/api/Windows.UI.Xaml.Controls.RelativePanel) - Fully implemented but needs more testing (please help and report any rendering differences between this and Universal's RelativePanel). Want to see this built-in in WPF? [Vote here](https://github.com/dotnet/wpf/issues/112)
+ - [RelativePanel](https://docs.microsoft.com/en-us/uwp/api/Windows.UI.Xaml.Controls.RelativePanel) - Identical behavior to UWP/WinUI. Want to see this built-in in WPF? [Vote here](https://github.com/dotnet/wpf/issues/112)
 
  ![RelativePanel](https://cloud.githubusercontent.com/assets/1378165/10120048/b76250f0-645e-11e5-9b4d-2a0d7026a467.gif)