Use python3 to create virtualenv in sandbox documentation
@@ -58,7 +58,7 @@ Install Oscar and its dependencies within a virtualenv:
$ git clone https://github.com/django-oscar/django-oscar.git
$ cd django-oscar
- $ mkvirtualenv oscar # needs virtualenvwrapper
+ $ mkvirtualenv --python=python3 oscar # needs virtualenvwrapper
(oscar) $ make sandbox
(oscar) $ sandbox/manage.py runserver
