old_contents: from django.conf.urls import patterns, url
  from django_prometheus import exports
  
  urlpatterns = [
      url(r'^metrics$', exports.ExportToDjangoView,
          name='prometheus-django-metrics'),
  ]
  
new_contents: from django.conf.urls import url
  from django_prometheus import exports
  
  urlpatterns = [
      url(r'^metrics$', exports.ExportToDjangoView,
          name='prometheus-django-metrics'),
  ]
  
subject: Fix Django 1.10 compatibility