Update sphinx to 1.6.7

[pyup-bot]

There's a new version of Sphinx available.
You are currently using 1.6.6. I have updated it to 1.6.7

These links might come in handy: PyPI | Changelog | Homepage

Changelog

1.6.7

==============================

Dependencies

Incompatible changes

Deprecated

Features added

Bugs fixed

• 1922: html search: Upper characters problem in French
• 4412: Updated jQuery version from 3.1.0 to 3.2.1
• 4438: math: math with labels with whitespace cause html error
• 2437: make full reference for classes, aliased with "alias of"
• 4434: pure numbers as link targets produce warning
• 4477: Build fails after building specific files
• 4449: apidoc: include "empty" packages that contain modules
• 3917: citation labels are tranformed to ellipsis
• 4501: graphviz: epub3 validation error caused if graph is not clickable
• 4514: graphviz: workaround for wrong map ID which graphviz generates
• 4525: autosectionlabel does not support parallel build
• 3953: Do not raise warning when there is a working intersphinx inventory
• 4487: math: ValueError is raised on parallel build. Thanks to jschueller.
• 2372: autosummary: invalid signatures are shown for type annotated functions
• 3942: html: table is not aligned to center even if :align: center

Testing

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@35b3c4f). Click here to learn what that means.
The diff coverage is 34.48%.

@@            Coverage Diff            @@
##             master      #59   +/-   ##
=========================================
  Coverage          ?   48.01%           
=========================================
  Files             ?       24           
  Lines             ?     2089           
  Branches          ?        0           
=========================================
  Hits              ?     1003           
  Misses            ?     1086           
  Partials          ?        0

Impacted Files	Coverage Δ
stackformation/aws/stacks/vpc.py	86.63% <34.48%> (ø)

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[pyup-bot]

Closing this in favor of #66