Upgrade to Django 2.1 using pip-tools

Closes #88

apps/profiles/views.py

@@ -1,4 +1,8 @@
-from django.core.urlresolvers import reverse
+try:
+    from django.urls import reverse
+except ImportError:
+    from django.core.urlresolvers import reverse
+
 from django.views.generic import DetailView, ListView, RedirectView, UpdateView
 
 from django.contrib.auth.mixins import LoginRequiredMixin