added external design pattern documentation links to behavioural patterns.

pypatterns/behavioral/iterator.py

@@ -4,6 +4,8 @@ from abc import ABCMeta, abstractmethod
 class Iterator(object):
     """
     An Iterator class for the Iterator design pattern.
+
+    External Iterator Pattern documentation: U{https://en.wikipedia.org/wiki/Iterator_pattern}
     """
     def __init__(self, iterable):
         """
@@ -24,6 +26,8 @@ class Iterator(object):
 class Iterable(object, metaclass=ABCMeta):
     """
     An abstract class representing an Iterable object as part of the Iterator design pattern.
+
+    External Iterator Pattern documentation: U{https://en.wikipedia.org/wiki/Iterator_pattern}
     """
     @abstractmethod
     def __next__(self):