Fixed #15724 -- Added update_wrapper import to utils.functional to be a bit more forgiving for 3rd party apps using that import.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15965 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/functional.py

@@ -1,4 +1,4 @@
-from functools import wraps
+from functools import wraps, update_wrapper
 
 
 # You can't trivially replace this `functools.partial` because this binds to