added str and repr for positionstate. returning pw on strategy apply

bfxbot/models.py

@@ -53,6 +53,11 @@ class PositionState(Enum):
         else:
             return "green"
 
+    def __str__(self):
+        return f"{self.name}"
+
+    def __repr__(self):
+        return self.__str__()
 
 class Ticker:
     def __init__(self, sec) -> None:
@@ -171,6 +176,8 @@ class SymbolStatus:
                 raise ValueError
             await self.__add_event__(e)
 
+        return pw
+
     async def __trigger_position_state_callbacks__(self, pw: PositionWrapper):
         await self.eh.call_position_state(self, pw)