s/django.core.urlresolvers/django.urls/g

Django 1.10 deprecation fix for Hackathon XIX
Addresses PLAT-1397

lms/templates/edxnotes/toggle_notes.html

@@ -1,7 +1,7 @@
 <%page args="course" expression_filter="h"/>
 <%!
 from django.utils.translation import ugettext as _
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from openedx.core.djangolib.js_utils import dump_js_escaped_json, js_escaped_string
 %>
 <%namespace name='static' file='/static_content.html'/>