old_contents: from django.conf.urls import url
  
  from . import views
  
  urlpatterns = [
      url(r'^$', views.index, name='index'),
      url(r'^create$', views.create, name='create'),
  ]
  
new_contents: from django.conf.urls import url
  
  from . import views
  
  urlpatterns = [
      url(r'^$', views.index, name='index'),
      url(r'^create$', views.create, name='add_playbook'),
  ]
  
subject: Rename URL as 'add_playbook'