should be upgraded to django 1.11

[elfelround]

it is true it doesnt work with django 2.0 but it does work with 1.11 so i think it would be best to upgrade requirements to LTS 1.11

[abu-yusuf-dev]

@elfelround For django latest versions please check here: https://github.com/Revel109/django-multiupload-lts