Remove Vector.__slots__, useless

diff --git a/pypol/coordinates.py b/pypol/coordinates.py
index a880178..d392e37 100644 (file)
--- a/pypol/coordinates.py
+++ b/pypol/coordinates.py
@@ -120,10 +120,6 @@ class Vector(Coordinates):
     This class represents displacements in space.
     """
 
-    __slots__ = (
-        '_coordinates',
-    )
-
     def __new__(cls, initial, terminal=None):
         if not isinstance(initial, Point):
             initial = Point(initial)