Document Python 3.4 support for Django 2.0

[Raffaele Salmaso]

The current django 2.0 release notes say that django 2.0 supports python 3.5+, not 3.4.
But in ​https://groups.google.com/forum/#!msg/django-developers/4rbVKJYm8DI/tVciTPHOEQAJ there is consensus not to drop 3.4 for now, at least for 2.0.
And django master is currently tested against python 3.4 3.5 and 3.6 ​https://github.com/django/django/blob/1c466994d9729a8902d34e277a3a685bef2a08e1/tox.ini#L24

[Raffaele Salmaso]

PR => ​https://github.com/django/django/pull/8078

[Tim Graham]

This is yet to be decided, see ​django-developers thread. There are more places to update than what you've done so far, I'll do it later if needed.

[Raffaele Salmaso]

Ok,
this is because some projects (in this case django-rest-framework => ​https://github.com/tomchristie/django-rest-framework/commit/7d4706fbcc28429489a4e01f3c29dd5121e35157 and ​https://groups.google.com/forum/#!topic/django-rest-framework/we77U58fcWQ ) see this stub and think it as a final decision.

[Tim Graham]

The mailing list didn't reveal a consensus to drop Python 3.4 support for Django 2.0. ​PR to update the docs.

[GitHub <noreply@…>]

In abd723c6:

Fixed #27855 -- Updated docs for Python 3.4 support in Django 2.0.

[Tim Graham <timograham@…>]

In bca1ffc8:

[1.11.x] Fixed #27855 -- Updated docs for Python 3.4 support in Django 2.0.

Backport of abd723c6a010be1bc06687d21e8841e07af6fde3 from master