Update django to 1.9.7

[full-take]

There's a new version of Django available.
You are currently using 1.9.6. I have updated it to 1.9.7

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

Changelog

1.9.7

==========================
Django 1.9.7 release notes

June 4, 2016

Django 1.9.7 fixes several bugs in 1.9.6.

Bugfixes

• Removed the need for the request context processor on the admin login
  page to fix a regression in 1.9 (:ticket:26558).

• Fixed translation of password validators' help_text in forms
  (:ticket:26544).

• Fixed a regression causing the cached template loader to crash when using
  lazy template names (:ticket:26603).

• Fixed on_commit callbacks execution order when callbacks make
  transactions (:ticket:26627).

• Fixed HStoreField to raise a ValidationError instead of crashing on
  non-dictionary JSON input (:ticket:26672).

• Fixed dbshell crash on PostgreSQL with an empty database name
  (:ticket:26698).

• Fixed a regression in queries on a OneToOneField that has to_field
  and primary_key=True (:ticket:26667).

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

Happy merging! 🤖