RiskManager

- deprecate GetProfitRate()

risk_manager.go

@@ -8,7 +8,6 @@ type RiskManager interface {
 	GetPnL() (float64, float64)
 	GetWinStreak() uint
 	GetLoseStreak() uint
-	GetProfitRate() float64
 
 	GetOrderSize(symbol string, bid float64) (float64, float64)
 	UpdatePositions() error