Reverted obsolete attribute

PixiEditor/Helpers/RelayCommand.cs

@@ -3,7 +3,6 @@ using System.Windows.Input;
 
 namespace PixiEditor.Helpers
 {
-    [Obsolete("Use GalaSoft.MvvmLight.CommandWpf.RelayCommand instead")]
     public class RelayCommand : ICommand
     {
         private readonly Action<object> execute;