Update django-user-sessions to 1.5.3

[pyup-bot]

There's a new version of django-user-sessions available.
You are currently using 1.4.0. I have updated it to 1.5.3

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

Changelog

1.5.0

• Added Django 1.11 support
• Added support for GeoIP2 library
• Added detection of Windows 10 and macOS from user-agent
• Fixed 73 -- Error when deleting individual session from list view
• Fixed 74 -- user agent not being shown in list view
• Resolved Django’s deprecation warnings (preliminary Django 2.0 support)
• Make templatetags return None instead of 'unknown', provide your own fallback
  value with default_if_none:
• Allow translation of fallback values

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

Happy merging! 🤖