fixed bug.

client/client.go

@@ -178,7 +178,7 @@ func (r *Client) readClientWsQuoteMessage() {
 
 		mt, msg, err := r.wsQuoteConn.ReadMessage()
 		if err != nil {
-			fmt.Println(err)
+			fmt.Printf("readClientWsQuoteMessage: %v\n", err)
 			break
 		}
 
@@ -282,7 +282,7 @@ func (r *Client) readClientWsTradeMessage() {
 
 		mt, msg, err := r.wsTradeConn.ReadMessage()
 		if err != nil {
-			fmt.Println(err)
+			fmt.Printf("readClientWsTradeMessage: %v\n", err)
 			break
 		}