Update WebRequestBehaviourHelper.cs

Author: coding2233

GameFramework/Runtime/WebRequest/WebRequestBehaviourHelper.cs

@@ -2,6 +2,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.IO;
 using System.Threading.Tasks;
 using UnityEngine;
 using UnityEngine.Networking;