fixed some breaking changes due to dependency updates

recipes/urls.py

@@ -15,7 +15,6 @@ Including another URLconf
     2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
 """
 from django.conf import settings
-from django.conf.urls import url
 from django.contrib import admin
 from django.urls import include, path, re_path
 from django.views.i18n import JavaScriptCatalog
@@ -35,7 +34,7 @@ urlpatterns = [
 ]
 
 if settings.ENABLE_METRICS:
-    urlpatterns += url('', include('django_prometheus.urls')),
+    urlpatterns += re_path('', include('django_prometheus.urls')),
 
 if settings.GUNICORN_MEDIA or settings.DEBUG:
     urlpatterns += re_path(r'^media/(?P<path>.*)$', serve, {'document_root': settings.MEDIA_ROOT}),