plistlib: remove HACK that does not pass python 3

Lib/ufoLib/plistlib.py

@@ -475,21 +475,3 @@ class PlistParser:
         self.addObject(Data.fromBase64(self.getData()))
     def end_date(self):
         self.addObject(_dateFromString(self.getData()))
-
-
-# cruft to support booleans in Python <= 2.3
-import sys
-if sys.version_info[:2] < (2, 3):
-    # Python 2.2 and earlier: no booleans
-    # Python 2.2.x: booleans are ints
-    class bool(int):
-        """Imitation of the Python 2.3 bool object."""
-        def __new__(cls, value):
-            return int.__new__(cls, not not value)
-        def __repr__(self):
-            if self:
-                return "True"
-            else:
-                return "False"
-    True = bool(1)
-    False = bool(0)