Migrate users.urls from url() to re_path()

users/urls.py

@@ -1,8 +1,8 @@
-from django.conf.urls import url
+from django.urls import re_path
 
 from .views import libravatar
 
 app_name = 'users'
 urlpatterns = (
-    url('^avatar/(?P<hash>[a-z0-9]+)$', libravatar, name='libravatar'),
+    re_path('^avatar/(?P<hash>[a-z0-9]+)$', libravatar, name='libravatar'),
 )