Remove unused and deprecated patters

`django.conf.urls.patterns` is deprecated and will be removed in Django 1.10.

reversion_compare/admin.py

@@ -16,7 +16,7 @@
 
 from django import template
 from django.conf import settings
-from django.conf.urls import patterns, url
+from django.conf.urls import url
 from django.contrib import admin
 try:
     from django.contrib.admin.utils import unquote, quote