Update werkzeug to 0.15.6

[pyup-bot]

This PR updates Werkzeug from 0.15.5 to 0.15.6.

Changelog

0.15.6

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

Released 2019-09-04

-   Work around a bug in pip that caused the reloader to fail on
 Windows when the script was an entry point. This fixes the issue
 with Flask's `flask run` command failing with "No module named
 Scripts\flask". :issue:`1614`
-   ``ProxyFix`` trusts the ``X-Forwarded-Proto`` header by default.
 :issue:`1630`
-   The deprecated ``num_proxies`` argument to ``ProxyFix`` sets
 ``x_for``, ``x_proto``, and ``x_host`` to match 0.14 behavior. This
 is intended to make intermediate upgrades less disruptive, but the
 argument will still be removed in 1.0. :issue:`1630`

Links

• PyPI: https://pypi.org/project/werkzeug
• Changelog: https://pyup.io/changelogs/werkzeug/
• Homepage: https://palletsprojects.com/p/werkzeug/

[coveralls]

Coverage remained the same at 96.713% when pulling 90bbe89 on pyup-update-werkzeug-0.15.5-to-0.15.6 into 2145698 on master.

[pyup-bot]

Closing this in favor of #222