Remove usage of url.patterns as per Django's deprecation warnings.

mayan/apps/events/urls.py

@@ -1,11 +1,10 @@
 from __future__ import unicode_literals
 
-from django.conf.urls import patterns, url
+from django.conf.urls import url
 
 from .views import EventListView, ObjectEventListView, VerbEventListView
 
-urlpatterns = patterns(
-    '',
+urlpatterns = [
     url(r'^all/$', EventListView.as_view(), name='events_list'),
     url(
         r'^for/(?P<app_label>[-\w]+)/(?P<model>[-\w]+)/(?P<object_id>\d+)/$',
@@ -15,4 +14,4 @@ urlpatterns = patterns(
         r'^by_verb/(?P<verb>[\w\-]+)/$', VerbEventListView.as_view(),
         name='events_by_verb'
     ),
-)
+]