Update django to 1.11.5

[pyup-bot]

There's a new version of Django available.
You are currently using 1.11.4. I have updated it to 1.11.5

These links might come in handy: PyPI | Changelog | Homepage

Changelog

1.11.5

===========================

September 5, 2017

Django 1.11.5 fixes a security issue and several bugs in 1.11.4.

CVE-2017-12794: Possible XSS in traceback section of technical 500 debug page

In older versions, HTML autoescaping was disabled in a portion of the template
for the technical 500 debug page. Given the right circumstances, this allowed
a cross-site scripting attack. This vulnerability shouldn't affect most
production sites since you shouldn't run with DEBUG = True (which makes
this page accessible) in your production settings.

Bugfixes

• Fixed GEOS version parsing if the version has a commit hash at the end (new
  in GEOS 3.6.2) (:ticket:28441).

• Added compatibility for cx_Oracle 6 (:ticket:28498).

• Fixed select widget rendering when option values are tuples (:ticket:28502).

• Django 1.11 inadvertently changed the sequence and trigger naming scheme on
  Oracle. This causes errors on INSERTs for some tables if
  'use_returning_into': False is in the OPTIONS part of DATABASES.
  The pre-1.11 naming scheme is now restored. Unfortunately, it necessarily
  requires an update to Oracle tables created with Django 1.11.[1-4]. Use the
  upgrade script in 🎫28451 comment 8 to update sequence and trigger
  names to use the pre-1.11 naming scheme.

• Added POST request support to LogoutView, for equivalence with the
  function-based logout() view (:ticket:28513).

• Omitted pages_per_range from BrinIndex.deconstruct() if it's None
  (:ticket:25809).

• Fixed a regression where SelectDateWidget localized the years in the
  select box (:ticket:28530).

• Fixed a regression in 1.11.4 where runserver crashed with non-Unicode
  system encodings on Python 2 + Windows (:ticket:28487).

• Fixed a regression in Django 1.10 where changes to a ManyToManyField
  weren't logged in the admin change history (:ticket:27998) and prevented
  ManyToManyField initial data in model forms from being affected by
  subsequent model changes (:ticket:28543).

• Fixed non-deterministic results or an AssertionError crash in some
  queries with multiple joins (:ticket:26522).

• Fixed a regression in contrib.auth's login() and logout() views
  where they ignored positional arguments (:ticket:28550).

===========================

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖