Fix typo on .travis.yml with django 1.7 download url exclude.
Fix typo on .travis.yml with django 1.7 download url exclude.

djangonauts/django-hstore,Stranger6667/django-hstore,pombredanne/django-hstore,Stranger6667/django-hstore,pombredanne/django-hstore,djangonauts/django-hstore,djangonauts/django-hstore,djangonauts/django-hstore,Stranger6667/django-hstore,Stranger6667/django-hstore,pombredanne/django-hstore,pombredanne/django-hstore