Update flask-login to 0.6.0

[pyup-bot]

This PR updates Flask-Login from 0.4.1 to 0.6.0.

Changelog

0.5.0

-------------

Released on February 9th, 2020

- New custom test client: `flask_login.FlaskLoginClient`.
You can use this to write clearer automated tests. 431
- Prefix authenticated user_id, remember, and remember_seconds in Flask Session
with underscores to prevent accidental usage in application code. 470
- Simplify user loading. 378
- Various documentation improvements. 393, 394, 397, 417
- Set session ID when setting next. 403
- Clear session identifier on logout. 404
- Ensure use of a safe and up-to-date version of Flask.
- Drop support of Python versions: 2.6, 3.3, 3.4 450

Links

• PyPI: https://pypi.org/project/flask-login
• Changelog: https://pyup.io/changelogs/flask-login/
• Repo: https://github.com/maxcountryman/flask-login
• Docs: https://pythonhosted.org/Flask-Login/

[pyup-bot]

Closing this in favor of #133