Update sphinx to 1.6.1

[pyup-bot]

There's a new version of sphinx available.
You are currently using 1.5.6. I have updated it to 1.6.1

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

Changelog

1.6

• LDML format support in i18n feature
• sphinx.addnodes.termsep
• Some functions and classes in sphinx.util.pycompat:
  zip_longest, product, all, any, next, open,
  class_types, base_exception, relpath, StringIO, BytesIO.
  Please use the standard library version instead;

If any deprecation warning like RemovedInSphinxXXXWarning are displayed,
please refer :ref:when-deprecation-warnings-are-displayed.

Features added

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

Happy merging! 🤖

[pyup-bot]

Closing this in favor of #267

[codecov-io]

Codecov Report

Merging #256 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #256   +/-   ##
======================================
  Coverage    83.7%   83.7%           
======================================
  Files           5       5           
  Lines         755     755           
======================================
  Hits          632     632           
  Misses        123     123

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