Update README.rst accordingly to Django 1.9

[prokaktus]

Hi!

TEMPLATE_LOADERS and TEMPLATE_CONTEXT_PROCESSORS deprecated and removed in Django 1.9.

[gregmuellegger]

Thanks for the addition, however I think that will break the description for old Django versions. It's not too big of a deal, since Django 1.8 is the only maintained LTS version at the moment and it already has the new TEMPLATES setting.

A change request to your pull request 😉

Add after the list of steps:

.. note: If you are using Django 1.7 or older, you need to change step 5 and 6 slightly. Use the ``TEMPLATE_LOADERS`` and ``TEMPLATE_CONTEXT_PROCESSORS`` settings instead of ``TEMPLATES``.

[prokaktus]

Just find SO-question about Django 1.9 compatibility. Because of settings, I think.
http://stackoverflow.com/questions/37083195/how-do-i-check-if-a-user-is-using-a-mobile-device-in-django-1-9/

[gregmuellegger]

Oh I haven't noticed you have added the line I have suggested. Thanks for the nudge, I've merged it.