[GREEN] add url for delete

lists/urls.py

@@ -21,4 +21,5 @@ urlpatterns = [
     url(r'^(\d+)/$', views.view_list, name='view_list'),
     url(r'^(\d+)/add_item$', views.add_item, name='add_item'),
     url(r'^new$', views.new_list, name='new_list'),
+    url(r'^(?P<list_id>\d+)/delete_todo/(?P<id>\d+)/$', views.delete_todo, name='delete_todo')
 ]