Bump sphinx-rtd-theme from 0.3.1 to 0.4.0

[dependabot-preview[bot]]

Bumps sphinx-rtd-theme from 0.3.1 to 0.4.0.

Changelog

*Sourced from [sphinx-rtd-theme's changelog](https://github.com/rtfd/sphinx_rtd_theme/blob/master/docs/changelog.rst).* > v0.4.0 > ====== > > This version made some changes to how JS and CSS were included > when the theme is used on Read the Docs. > > > New Features > ------------- > > Fixes > ----- > > * Do not rely on readthedocs.org for CSS/JS ([#614](https://github-redirect.dependabot.com/rtfd/sphinx_rtd_theme/issues/614)) > * Color accessibility improvements on the left navigation > > Other Changes > -------------- > > * Write theme version and build date at top of JavaScript and CSS > * Changed code and literals to use a native font stack ([#612](https://github-redirect.dependabot.com/rtfd/sphinx_rtd_theme/issues/612)) > * Fix small styling issues

Commits

- [`5a16288`](https://github.com/rtfd/sphinx_rtd_theme/commit/5a16288abca8b797b9e04500965ca62595fdcfc9) Merge pull request [#649](https://github-redirect.dependabot.com/rtfd/sphinx_rtd_theme/issues/649) from rtfd/version-0.4.0 - [`69fafa2`](https://github.com/rtfd/sphinx_rtd_theme/commit/69fafa2e0a05792c239933b38587ced540b1ae1f) Version 0.4.0 updates - [`53e2a78`](https://github.com/rtfd/sphinx_rtd_theme/commit/53e2a78457fa200b3fd1a690e7a8813b58ac6557) Merge pull request [#614](https://github-redirect.dependabot.com/rtfd/sphinx_rtd_theme/issues/614) from rtfd/always-bundle-js-css - [`4b45725`](https://github.com/rtfd/sphinx_rtd_theme/commit/4b45725f682494dc4ab4ef8a775c954840fa961a) Merge branch 'master' into always-bundle-js-css - [`0051b91`](https://github.com/rtfd/sphinx_rtd_theme/commit/0051b910148023cd3c7515b31c03c0a846c95ffd) Change Lato font to webfont (version 2.015) ([#639](https://github-redirect.dependabot.com/rtfd/sphinx_rtd_theme/issues/639)) - [`9fdadd5`](https://github.com/rtfd/sphinx_rtd_theme/commit/9fdadd5a6fcefdc5df0db80c6335a07d11eea616) Bundle Roboto Slab as a real web font (not just ttf) ([#642](https://github-redirect.dependabot.com/rtfd/sphinx_rtd_theme/issues/642)) - [`17ecdc6`](https://github.com/rtfd/sphinx_rtd_theme/commit/17ecdc6839ba49f3bee1ba84ea88987392cf86a5) Merge pull request [#638](https://github-redirect.dependabot.com/rtfd/sphinx_rtd_theme/issues/638) from rtfd/increase-color-accessibility - [`ece4866`](https://github.com/rtfd/sphinx_rtd_theme/commit/ece48667b9acd514c1ef055b55f7291e6a0840ea) Merge branch 'master' into increase-color-accessibility - [`77f003e`](https://github.com/rtfd/sphinx_rtd_theme/commit/77f003e3d9ccb0f1dc7c78c284500cdd561b5116) Merge pull request [#606](https://github-redirect.dependabot.com/rtfd/sphinx_rtd_theme/issues/606) from rtfd/version-in-js - [`7e3a380`](https://github.com/rtfd/sphinx_rtd_theme/commit/7e3a380f2b91d69e8c846d93f9992fd7a2a062ee) Merge branch 'master' into version-in-js - Additional commits viewable in [compare view](https://github.com/rtfd/sphinx_rtd_theme/compare/0.3.1...0.4.0)

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[dependabot-preview[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.