feat：修复k线问题报错

@@ -82,7 +82,7 @@ class Kline
         $vol = $kline['volume'];
         $volQuote = $kline['turnover'];
         $uts = $kline['timestamp'];
-        $isFinal = $kline['final'];
+        $isFinal = $kline['confirm'];
         return new Kline($time, $open, $high, $low, $close, $vol, $volQuote, $uts, $isFinal);
     }
 }