Move createBinding to Binding.fs since it isn't used anywhere else

src/Elmish.WPF.Tests/DynamicViewModelTests.fs

@@ -129,7 +129,7 @@ module Helpers =
        AutoRequery = autoRequery }
      |> CmdData
      |> BaseBindingData
-     |> createBinding) name
+     |> Binding.createBinding) name
 
 
   let internal subModel

src/Elmish.WPF/Binding.fs

@@ -8,9 +8,13 @@ open Elmish
 module Binding =
   open BindingData
 
+  let internal createBinding data name =
+    { Data = data
+      Name = name }
+
   let internal mapData f binding =
-    { Name = binding.Name
-      Data = binding.Data |> f }
+    { Data = binding.Data |> f
+      Name = binding.Name }
 
   /// Maps the model of a binding via a contravariant mapping.
   let mapModel (f: 'a -> 'b) (binding: Binding<'b, 'msg>) = f |> mapModel |> mapData <| binding

src/Elmish.WPF/DynamicViewModel.fs

@@ -18,10 +18,6 @@ type Binding<'model, 'msg> =
 [<AutoOpen>]
 module internal Helpers =
 
-  let createBinding data name =
-    { Name = name
-      Data = data }
-
   type SubModelSelectedItemLast with
     member this.CompareBindings() : Binding<'model, 'msg> -> Binding<'model, 'msg> -> int =
       fun a b -> this.Recursive(a.Data) - this.Recursive(b.Data)