Import reverse from core.urlresolvers instead of shortcuts for the sa…

…ke of Django 1.9 compatibility

src/wagtail_personalisation/views.py

@@ -1,8 +1,9 @@
 from __future__ import absolute_import, unicode_literals
 
 from django import forms
+from django.core.urlresolvers import reverse
 from django.http import HttpResponseForbidden, HttpResponseRedirect
-from django.shortcuts import get_object_or_404, reverse
+from django.shortcuts import get_object_or_404
 from django.utils.translation import ugettext_lazy as _
 from wagtail.contrib.modeladmin.options import ModelAdmin, modeladmin_register
 from wagtail.contrib.modeladmin.views import IndexView