Remove pl pct from position

Author: kylewidmann

pytrade/interfaces/position.py

@@ -23,12 +23,6 @@ def pl(self) -> float:
         """Profit (positive) or loss (negative) of the current position in cash units."""
         raise NotImplementedError()
 
-    @property
-    @abstractmethod
-    def pl_pct(self) -> float:
-        """Profit (positive) or loss (negative) of the current position in percent."""
-        raise NotImplementedError()
-
     @property
     @abstractmethod
     def is_long(self) -> bool: