[Mod]change ping-pong of HuobiGateway
[Mod]change ping-pong of HuobiGateway

vnpy/vnpy,andrewchenshx/vnpy,andrewchenshx/vnpy,bigdig/vnpy,andrewchenshx/vnpy,msincenselee/vnpy,vnpy/vnpy,msincenselee/vnpy,bigdig/vnpy,msincenselee/vnpy,andrewchenshx/vnpy,bigdig/vnpy,andrewchenshx/vnpy,bigdig/vnpy,msincenselee/vnpy