Update mdbook requirement from 0.3.1 to 0.4.3

[dependabot-preview[bot]]

Updates the requirements on mdbook to permit the latest version.

Release notes

Sourced from mdbook's releases.

v0.4.3

See https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-043 for a complete list of changes.

Changelog

Sourced from mdbook's changelog.

mdBook 0.4.3

9278b83...9278b83

Added

• Added output.html.cname option to emit a CNAME file which is used by GitHub Pages to know which domain is being used. #1311

Changed

• mdbook test no longer stops on the first test failure, but instead will run all the tests. #1313
• Removed the local font source for Source Code Pro, as the locally installed font may not render properly on FireFox on macOS. #1307

Fixed

• Added newline to end of .nojekyll file. #1310
• Fixed missing space before draft chapter titles. #1309

mdBook 0.4.2

649f355...9278b83

Changed

• The "show hidden lines" icon has changed from the "expand" icon to an "eye". #1281
• Updated highlight.js. This adds several languages: c, c-like (effectively cpp), csharp (replaces cs), kotlin, less, lua, php-template, plaintext, python-repl, r, scss, typescript. #1277

Fixed

• Fixed SUMMARY links that contained newlines. #1291
• Fixed SUMMARY links that contain %20 spaces. #1293
• Fixed favicon so that if only the png or svg is overridden, the other is not automatically included in the <link> tag. #1272

mdBook 0.4.1

d4df7e7...649f355

Changed

• Removed several outdated dev-dependencies. #1267

Fixed

Commits

• cf7663f Merge pull request #1317 from ehuss/release-next
• 3155c63 Release 0.4.3
• 4df9ec9 Merge pull request #1307 from camelid/prefer-bundled-scp
• 73cabeb Remove local version from @font-face
• 4b77302 Merge pull request #1309 from nerosnm/add-missing-space
• 33ea661 Merge pull request #1310 from dtolnay/nojekyll
• 1b18740 Merge pull request #1311 from dtolnay/cname
• 6fed9e5 Merge pull request #1313 from guswynn/master
• fd59dc7 Adjust wording
• 146bea4 Merge pull request #1314 from camelid/patch-1
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #11.