Bump webob from 1.4.1 to 1.8.6

[dependabot-preview]

Bumps webob from 1.4.1 to 1.8.6.

Changelog

Sourced from webob's changelog.

1.8.6 (2020-01-21)

Experimental Features

- The SameSite value now includes a new option named "None", this is a new
  change that was introduced in
  https://tools.ietf.org/html/draft-west-cookie-incrementalism-00
Please be aware that older clients are incompatible with this change:
https://www.chromium.org/updates/same-site/incompatible-clients, WebOb does
not enable SameSite on cookies by default, so there is no backwards
incompatible change here.
See Pylons/webob#406


Validation of SameSite values can be disabled by toggling a module flag. This
is in anticipation of future changes in evolving cookie standards.
The discussion in Pylons/webob#407 (which initially
expanded the allowed options) notes the sudden change to browser cookie
implementation details may happen again.
In May 2019, Google announced a new model for privacy controls in their
browsers, which affected the list of valid options for the SameSite attribute
of cookies. In late 2019, the company began to roll out these changes to their
browsers to force developer adoption of the new specification.
See https://www.chromium.org/updates/same-site and
https://blog.chromium.org/2019/10/developers-get-ready-for-new.html for more
details on this change.
See Pylons/webob#409


1.8.5 (2019-01-03)
Warnings

- Fixed one last remaining invalid escape sequence in a docstring.
1.8.4 (2018-11-11)
Bugfix

- Response.content_type now accepts unicode strings on Python 2 and encodes
  them to latin-1. See https://github.com/Pylons/webob/pull/389 and
  https://github.com/Pylons/webob/issues/388
</tr></table> ... (truncated)
</code></pre>
</blockquote>
</details>
<details>
<summary>Commits</summary>

<ul>
<li><a href="https://github.com/Pylons/webob/commit/77c67bc73301eee396fe3f96baed0435826cbebe"><code>77c67bc</code></a> Prep version 1.8.6</li>
<li><a href="https://github.com/Pylons/webob/commit/41a1ebe1f6a6f337188cce22280477d48f1b95bb"><code>41a1ebe</code></a> Remove RFC section on REMOTE_HOST</li>
<li><a href="https://github.com/Pylons/webob/commit/4887452ad3081d849fee1cfa50c4160f3a5c329a"><code>4887452</code></a> Extra word</li>
<li><a href="https://github.com/Pylons/webob/commit/bc737b3ebe40be69cc4fdc639559031790ddb9be"><code>bc737b3</code></a> Update documentation surrounding SameSite support</li>
<li><a href="https://github.com/Pylons/webob/commit/aac9d239f675a176d1d3746324b36bbdf9b4d517"><code>aac9d23</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/Pylons/webob/issues/409">#409</a> from jvanasco/fix-optional_samesite_validation</li>
<li><a href="https://github.com/Pylons/webob/commit/1e5b537c57d77d302ae8ed94e09b547d915501d6"><code>1e5b537</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/Pylons/webob/issues/407">#407</a> from marc1n/master</li>
<li><a href="https://github.com/Pylons/webob/commit/3fe7f6b67fc82ea792f36de5a4401db35ffee99d"><code>3fe7f6b</code></a> Prep v1.8.5</li>
<li><a href="https://github.com/Pylons/webob/commit/e07a7eda727a89d02937ac55418f1ce531b72990"><code>e07a7ed</code></a> Missed an invalid escape sequence</li>
<li><a href="https://github.com/Pylons/webob/commit/1518c99ac6c5c556b77691fb9eef4a474613efca"><code>1518c99</code></a> Prep for 1.8.4</li>
<li><a href="https://github.com/Pylons/webob/commit/9ac100925c6779637263dcc0ad26741bec02ad92"><code>9ac1009</code></a> Bring coverage back to 100%</li>
<li>Additional commits viewable in <a href="https://github.com/Pylons/webob/compare/1.4.1...1.8.6">compare view</a></li>
</ul>
</details>

<br />
</code></pre>


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Superseded by #95.