Client for market center
- SubscribeTicker(exchangeName, currencyPair, period) (error)
- SubscribeDepth(exchangeName, currencyPair, period) (error)
- SubscribeTrade(exchangeName, currencyPair, period) (error)
- GetTicker(exchangeName, currencyPair) (*Ticker, error)
- GetDepth(exchangeName, currencyPair) (*Depth, error)
- GetTrade(exchangeName, currencyPair) (*Trade, error)
- GetSupportList() []