[PyUP] Update django to 1.11.8

[pyup-bot]

There's a new version of Django available.
You are currently using 1.11.7. I have updated it to 1.11.8

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

Changelog

1.11.8

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

December 2, 2017

Django 1.11.8 fixes several bugs in 1.11.7.

Bugfixes

• Reallowed, following a regression in Django 1.10, AuthenticationForm to
  raise the inactive user error when using ModelBackend (:ticket:28645).

• Added support for QuerySet.values() and values_list() for
  union(), difference(), and intersection() queries
  (:ticket:28781).

• Fixed incorrect index name truncation when using a namespaced db_table
  (:ticket:28792).

• Made QuerySet.iterator() use server-side cursors on PostgreSQL after
  values() and values_list() (:ticket:28817).

• Fixed crash on SQLite and MySQL when ordering by a filtered subquery that
  uses nulls_first or nulls_last (:ticket:28848).

• Made query lookups for CICharField, CIEmailField, and CITextField
  use a citext cast (:ticket:28702).

• Fixed a regression in caching of a GenericForeignKey when the referenced
  model instance uses multi-table inheritance (:ticket:28856).

• Fixed "Cannot change column 'x': used in a foreign key constraint" crash on
  MySQL with a sequence of AlterField and/or RenameField operations in
  a migration (:ticket:28305).

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

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

Happy merging! 🤖

[codecov-io]

Codecov Report

Merging #21 into master will decrease coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
- Coverage   87.81%   87.65%   -0.16%     
==========================================
  Files          45       42       -3     
  Lines        1329     1264      -65     
  Branches      169      160       -9     
==========================================
- Hits         1167     1108      -59     
+ Misses        131      126       -5     
+ Partials       31       30       -1

Impacted Files	Coverage Δ
wapps/templatetags/social.py	55.55% <0%> (-11.12%)	⬇️
wapps/middleware.py	91.3% <0%> (ø)	⬆️
wapps/gallery/apps.py	100% <0%> (ø)	⬆️
wapps/blog/wagtail_hooks.py	100% <0%> (ø)	⬆️
wapps/gallery/migrations/__init__.py
tests/app/views.py
tests/app/urls.py
wapps/blog/utils.py	100% <0%> (+20.58%)	⬆️

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[pyup-bot]

Closing this in favor of #22