[Fix]Close #581
[Fix]Close #581

vnpy/vnpy,bigdig/vnpy,harveywwu/vnpy,msincenselee/vnpy,harveywwu/vnpy,rrrrrr8/vnpy,andrewchenshx/vnpy,wisfern/vnpy,rrrrrr8/vnpy,harveywwu/vnpy,bigdig/vnpy,msincenselee/vnpy,wisfern/vnpy,vnpy/vnpy,rrrrrr8/vnpy,harveywwu/vnpy,rrrrrr8/vnpy,andrewchenshx/vnpy,harveywwu/vnpy,harveywwu/vnpy,msincenselee/vnpy,wisfern/vnpy,rrrrrr8/vnpy,andrewchenshx/vnpy,wisfern/vnpy,msincenselee/vnpy,bigdig/vnpy,wisfern/vnpy,rrrrrr8/vnpy,andrewchenshx/vnpy,wisfern/vnpy,bigdig/vnpy,andrewchenshx/vnpy