[Modify] Rename it

websocket-sharp/PayloadData.cs

@@ -142,7 +142,7 @@ namespace WebSocketSharp
       }
     }
 
-    internal bool IncludesReservedCloseStatusCode {
+    internal bool HasReservedCode {
       get {
         return _length > 1 && Code.IsReserved ();
       }

websocket-sharp/WebSocket.cs

@@ -1305,7 +1305,7 @@ namespace WebSocketSharp
     private bool processCloseFrame (WebSocketFrame frame)
     {
       var payload = frame.PayloadData;
-      close (new CloseEventArgs (payload), !payload.IncludesReservedCloseStatusCode, false, true);
+      close (new CloseEventArgs (payload), !payload.HasReservedCode, false, true);
 
       return false;
     }