Update werkzeug to 0.16.0

[pyup-bot]

This PR updates Werkzeug from 0.15.6 to 0.16.0.

Changelog

0.16.0

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

Unreleased

-   Deprecate most top-level attributes provided by the ``werkzeug``
 module in favor of direct imports. The deprecated imports will be
 removed in version 1.0.

 For example, instead of ``import werkzeug; werkzeug.url_quote``, do
 ``from werkzeug.urls import url_quote``. A deprecation warning will
 show the correct import to use. ``werkzeug.exceptions`` and
 ``werkzeug.routing`` should also be imported instead of accessed,
 but for technical reasons can't show a warning.

 :issue:`2`, :pr:`1640`

Links

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

[codecov]

Codecov Report

Merging #146 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #146   +/-   ##
=======================================
  Coverage   98.85%   98.85%           
=======================================
  Files          35       35           
  Lines         522      522           
=======================================
  Hits          516      516           
  Misses          6        6

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[pyup-bot]

Closing this in favor of #193