Update mdbook requirement from 0.3.1 to 0.4.7

[dependabot-preview[bot]]

Updates the requirements on mdbook to permit the latest version.

Release notes

Sourced from mdbook's releases.

v0.4.7

See https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-047 for a complete list of changes.

Changelog

Sourced from mdbook's changelog.

mdBook 0.4.7

9a9eb01...c83bbd6

Changed

• Updated shlex parser to fix a minor parsing issue (used by the preprocessor/backend custom command config). #1471
• Enhanced text contrast of light theme to improve accessibility. #1470

Fixed

• Fixed some issues with fragment scrolling and linking. #1463

mdBook 0.4.6

eaa6914...1a0c296

Changed

• The chapter name is now included in the search breadcrumbs. #1389
• Pressing Escape will remove the ?highlight argument from the URL. #1427
• mdbook init --theme will now place the theme in the root of the book directory instead of in the src directory. #1432
• A custom renderer that sets the command to a relative path now interprets the relative path relative to the book root. Previously it was inconsistent based on the platform (either relative to the current directory, or relative to the renderer output directory). Paths relative to the output directory are still supported with a deprecation warning. #1418
• The theme directory in the config is now interpreted as relative to the book root, instead of the current directory. #1405
• Handle UTF-8 BOM for chapter sources. #1285
• Removed extra whitespace added to {{#playground}} snippets. #1375

Fixed

• Clicking on a search result with multiple search words will now correctly highlight all of the words. #1426
• Properly handle < and > characters in the table of contents. #1376
• Fixed to properly serialize the build table in the config, which prevented setting it in the API. #1378

mdBook 0.4.5

... (truncated)

Commits

• 3f39ba8 Merge pull request #1474 from ehuss/bump-version
• 7da3871 Update to 0.4.7
• c83bbd6 Merge pull request #1463 from ehuss/fix-header-scroll
• fad3c66 Merge pull request #1461 from ehuss/guide-repo-link
• f8b9054 Merge pull request #1470 from tim-seoss/light_theme_contrast_enhancement
• f26116a Upgrade to shlex 1 (#1471)
• 7f59fdd Enhance text contrast of light theme to improve accessibility.
• 45d41ea Fix some issues with fragment scrolling and linking.
• 2b5890e Add git repository url link to user guide.
• 0b9570b Merge pull request #1456 from danieleades/typo
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #16.