RiskManager

- add current price

risk_manager.go

@@ -1,6 +1,6 @@
 package sentio
 
 type RiskManager interface {
-	StopLoss(symbol string) float64
-	TakeProfit(symbol string) float64
+	StopLoss(symbol string, current float64) float64
+	TakeProfit(symbol string, current float64) float64
 }