[Add]support for exchanges
[Add]support for exchanges

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