fixes to itbit createOrder/cancelOrder
fixes to itbit createOrder/cancelOrder

aiueogawa/ccxt,ccxt/ccxt,tritoanst/ccxt,aiueogawa/ccxt,aiueogawa/ccxt,ccxt/ccxt,tritoanst/ccxt,tritoanst/ccxt,ccxt/ccxt,ccxt/ccxt,aiueogawa/ccxt,ccxt/ccxt,tritoanst/ccxt