Add ticket number to release notes for Django 1.11
@@ -27,7 +27,7 @@ Oscar 1.4 is compatible with Django 1.8, 1.9, 1.10 and 1.11 as well as Python 2
What's new in Oscar 1.5?
------------------------
- - Support for Django 1.11
+ - Support for Django 1.11 (:issue:`2221`)
- Google Analytics tracking code has been migrated to Universal Analytics.
