(Engine) Gate-IO Websocket subscription pairs case sensitivity  (#352)
(Engine) Gate-IO Websocket subscription pairs case sensitivity  (#352)

* convert pairs to upper case as gateio websocket subscription is case sensative

* Update gateio_websocket.go

thrasher-/gocryptotrader,thrasher-/gocryptotrader,thrasher-/gocryptotrader,thrasher-/gocryptotrader,thrasher-/gocryptotrader