fix: add changes from code review

src/PepperDash.Essentials.Core/Feedbacks/IntFeedback.cs

@@ -43,6 +43,7 @@ namespace PepperDash.Essentials.Core
         /// it will NOT reflect an actual value from a device until <seealso cref="FireUpdate"/> has been called
         /// </remarks>
         /// <param name="valueFunc">Delegate to invoke when this feedback needs to be updated</param>
+        [Obsolete("use constructor with Key parameter. This constructor will be removed in a future version")]
         public IntFeedback(Func<int> valueFunc)
             : this(null, valueFunc)
         {