Modified JavascriptClientGenerator to handle nullable types and indicate them by ?type instead of Nullable<>. Bumped package version to 1.9.4

Rest.Net.Example/Program.cs

@@ -50,7 +50,7 @@ namespace MontoyaTech.Rest.Net.Example
 
         public string[] Array = null;
 
-        public ulong Property { get; set; }
+        public ulong? Property { get; set; }
 
         public User() { }