Bump sphinx from 1.8.4 to 1.8.5 in /docs (#2689)
Bump sphinx from 1.8.4 to 1.8.5 in /docs (#2689)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 1.8.4 to 1.8.5.
<details>
<summary>Changelog</summary>

*Sourced from [sphinx's changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES).*

> Release 1.8.5 (released Mar 10, 2019)
> =====================================
> 
> Bugs fixed
> ----------
> 
> * LaTeX: Remove extraneous space after author names on PDF title page (refs: [#6004](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6004))
> * [#6026](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6026): LaTeX: A cross reference to definition list does not work
> * [#6046](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6046): LaTeX: ``TypeError`` is raised when invalid latex_elements given
> * [#6067](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6067): LaTeX: images having a target are concatenated to next line
> * [#6067](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6067): LaTeX: images having a target are not aligned even if specified
> * [#6149](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6149): LaTeX: ``:index:`` role in titles causes ``Use of \[@&#8203;icentercr](https://github.com/icentercr) doesn't
>   match its definition`` error on latexpdf build
> * [#6019](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6019): imgconverter: Including multipage PDF fails
> * [#6047](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6047): autodoc: ``autofunction`` emits a warning for method objects
> * [#6028](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6028): graphviz: Ensure the graphviz filenames are reproducible
> * [#6068](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6068): doctest: ``skipif`` option may remove the code block from documentation
> * [#6136](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6136): ``:name:`` option for ``math`` directive causes a crash
> * [#6139](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6139): intersphinx: ValueError on failure reporting
> * [#6135](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6135): changes: Fix UnboundLocalError when any module found
> * [#3859](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/3859): manpage: code-block captions are not displayed correctly
</details>
<details>
<summary>Commits</summary>

- [`591bdd7`](https://github.com/sphinx-doc/sphinx/commit/591bdd74c0739269a9b2651aec2fa2554a3d8d23) Bump to 1.8.5 final
- [`f44aa23`](https://github.com/sphinx-doc/sphinx/commit/f44aa2376180a24eed4d0227fcc1a304662bc1ef) Merge pull request [#6159](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6159) from tk0miya/3859_code-block_captions_for_manpage
- [`fc99687`](https://github.com/sphinx-doc/sphinx/commit/fc9968710561582752d5038618dd0dbfce779734) Fix [#3859](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/3859): manpage: code-block captions are not displayed correctly
- [`f57041a`](https://github.com/sphinx-doc/sphinx/commit/f57041ab000c6c2b1e672f3d963d849ecd3ee7ab) Merge pull request [#6152](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6152) from tk0miya/6149_index_on_title
- [`05d3e37`](https://github.com/sphinx-doc/sphinx/commit/05d3e37ef798fc3ea621f973e83211102fa3eab8) Fix [#6149](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6149): LaTeX: :index: role titles causes build error of LaTeX
- [`9f283bc`](https://github.com/sphinx-doc/sphinx/commit/9f283bc3f1d6a7f9aacfaa377f0983d3709a0dc1) Merge pull request [#6153](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6153) from tk0miya/use_bionic_on_circleci
- [`f61a5f9`](https://github.com/sphinx-doc/sphinx/commit/f61a5f91f75556c3e886fbef7621acd77760bf51) Fix test: imgconverter expects size of images fixed
- [`f7315ed`](https://github.com/sphinx-doc/sphinx/commit/f7315edfc28cb9712872f02da60945e7e28802ce) Use bionic (py36) on Circle CI
- [`f03c2d4`](https://github.com/sphinx-doc/sphinx/commit/f03c2d4fe22500e751a17a84d299cf5f0de901ee) Update CHANGES for PR [#6135](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6135)
- [`7c50f8f`](https://github.com/sphinx-doc/sphinx/commit/7c50f8f08bfb80e0d03c02bffadaf9efcefbda50) Merge pull request [#6135](https://github-redirect.dependabot.com/sphinx-doc/sphinx/issues/6135) from bz2/changes_module_1.8
- Additional commits viewable in [compare view](https://github.com/sphinx-doc/sphinx/compare/v1.8.4...v1.8.5)
</details>
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