Update dependency Flask-Login to v0.5.0

[renovate]

This PR contains the following updates:

Package	Update	Change
Flask-Login	minor	==0.4.1 -> ==0.5.0

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Release Notes

maxcountryman/flask-login

v0.5.0

Compare Source

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

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