Merge #186

186: Update sphinx_rtd_theme to 0.5.1 r=YourLocalBlake a=pyup-bot


This PR updates [sphinx_rtd_theme](https://pypi.org/project/sphinx_rtd_theme) from **0.5.0** to **0.5.1**.



*The bot wasn't able to find a changelog for this release. [Got an idea?](https://github.com/pyupio/changelogs/issues/new)*

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/sphinx-rtd-theme
  - Repo: https://github.com/readthedocs/sphinx_rtd_theme
</details>



Co-authored-by: pyup-bot <github-bot@pyup.io>
Co-authored-by: Blake <yourlocalblake@gmail.com>

doc-requirements.txt

@@ -1,3 +1,3 @@
 mock==4.0.3
-sphinx==3.4.3
-sphinx_rtd_theme==0.5.0
+sphinx_rtd_theme==0.5.1
+sphinx==3.4.3