updated django versions on .travis.yml
updated django versions on .travis.yml

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