chore(deps-dev): Update sphinx requirement from <2.4.0,>=2.1.2 to >=2.1.2,<3.1.0

[dependabot-preview]

Updates the requirements on sphinx to permit the latest version.

Changelog

Sourced from sphinx's changelog.

Release 3.0.3 (released Apr 26, 2020)

Features added

• C, parse array declarators with static, qualifiers, and VLA specification.

Bugs fixed

• #7516: autodoc: crashes if target object raises an error on accessing its attributes

Release 3.0.2 (released Apr 19, 2020)

Features added

• C, parse attributes and add :confval:c_id_attributes and :confval:c_paren_attributes to support user-defined attributes.

Bugs fixed

• #7461: py domain: fails with IndexError for empty tuple in type annotation
• #7510: py domain: keyword-only arguments are documented as having a default of None
• #7418: std domain: :rst:role:term role could not match case-insensitively
• #7461: autodoc: empty tuple in type annotation is not shown correctly
• #7479: autodoc: Sphinx builds has been slower since 3.0.0 on mocking
• C++, fix spacing issue in east-const declarations.
• #7414: LaTeX: Xindy language options were incorrect
• sphinx crashes with ImportError on python3.5.1

Release 3.0.1 (released Apr 11, 2020)

Incompatible changes

• #7418: std domain: :rst:dir:term role becomes case sensitive

Bugs fixed

• #7428: py domain: a reference to class None emits a nitpicky warning
• #7445: py domain: a return annotation None in the function signature is not converted to a hyperlink when using intersphinx

... (truncated)

Commits

• 241be80 Bump to 3.0.3 final
• 49e7118 Merge pull request #7556 from jakobandersen/c_array_declarator
• 082bf7d C, parse all types of array declarators
• 31a34c2 Update CHANGES for PR #7156
• a65db71 Merge pull request #7520 from a-recknagel/3.0.x
• 84413ed fix for #7516
• d08d4de Bump version
• 2458dd3 Bump to 3.0.2 final
• bf4d3da Merge pull request #7511 from tk0miya/7510_kwonlyarg_None
• b2140c8 Fix #7510: py domain: keyword-only arguments are wrongly rendered
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

[codecov]

Codecov Report

Merging #173 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #173   +/-   ##
=======================================
  Coverage   85.08%   85.08%           
=======================================
  Files          22       22           
  Lines        1602     1602           
=======================================
  Hits         1363     1363           
  Misses        239      239           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9b0eacc...c2b58f0. Read the comment docs.

[dependabot-preview]

Superseded by #182.