Updated to support Django 2.0

[romamo]

[Benbb96]

Thanks @Romamo , it worked for me on Django 2.0.3 👍

[abid-mehmood]

Thanks @Romamo , it worked for me too on Django 2.0.7 👍

[0xLuz]

Thanks, @Romamo !!! It's working for me now with Django==2.1.1

For those who want to use Romamo's fix as a dependency, add this to your requirements.txt file:

-e git+https://github.com/Romamo/django-geoposition#egg=django-geoposition

[schlunsen]

When will this be merged?