Bump Django dependency to the latest available (#243)

* Bump Django dependency to the latest available

Fixes #242

* Use the new django.urls API

web/Dockerfile.dev

@@ -29,7 +29,7 @@ RUN set -ex \
 		                psycopg2 \
 		                dj-database-url \
 		                mysqlclient \
-	&& pip install -U django==1.10 \
+	&& pip install -U django>=1.11\
 	&& apk del .build-deps \
 	&& addgroup -S mailman \
 	&& adduser -S -G mailman mailman \

web/mailman-web/urls.py

@@ -19,7 +19,7 @@
 
 from django.conf.urls import include, url
 from django.contrib import admin
-from django.core.urlresolvers import reverse_lazy
+from django.urls import reverse_lazy
 from django.views.generic import RedirectView
 
 urlpatterns = [