Error

- add ErrOrderCreateTimeout

errors.go

@@ -9,4 +9,5 @@ var (
 	ErrLowTakeProfit         = errors.New("base price is too close to take profit")
 	ErrLowVolatility         = errors.New("too low volatility")
 	ErrRiskManagementPrevent = errors.New("RiskManagement: prevent trading")
+	ErrOrderCreateTimeout    = errors.New("CreateOrder: timeout while meeting `limit_price`")
 )