Response Unmarshaller for UpdateApp operation
Inheritance: JsonResponseUnmarshaller
 public static UpdateAppResponseUnmarshaller GetInstance()
 {
     if (instance == null)
       {
     instance = new UpdateAppResponseUnmarshaller();
       }
       return instance;
 }
 public static UpdateAppResponseUnmarshaller GetInstance()
 {
     if (instance == null)
     {
         instance = new UpdateAppResponseUnmarshaller();
     }
     return(instance);
 }