Update mdbook requirement from 0.3.1 to 0.4.11

[dependabot-preview[bot]]

Updates the requirements on mdbook to permit the latest version.

Release notes

Sourced from mdbook's releases.

v0.4.11

See https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-0411 for a complete list of changes.

Changelog

Sourced from mdbook's changelog.

mdBook 0.4.11

e440094...2cf00d0

Added

• Added support for Rust 2021 edition. #1596
• Added mdbook completions subcommand which provides shell completions. #1425
• Added --title and --ignore flags to mdbook init to avoid the interactive input. #1559

Changed

• If running a Rust example does not have any output, it now displays the text "No output" instead of not showing anything. #1599
• Code block language tags can now be separated by space or tab (along with commas) to match the behavior of other sites like GitHub and rustdoc. #1469
• Updated warp (the web server) to the latest version. This also updates the minimum supported Rust version to 1.46. #1612
• Updated to highlight.js 11. This has various highlighting improvements. #1597

Fixed

• Inline code blocks inside a header are no longer highlighted when output.html.playground.editable is true. #1613

mdBook 0.4.10

2f7293a...dc2062a

Changed

• Reverted breaking change in 0.4.9 that removed the __non_exhaustive marker on the Book struct. #1572
• Updated handlebars to 4.0. #1550
• Removed the chapter_begin id on the print page's chapter separators. #1541

mdBook 0.4.9

7e01cf9...d325c60

Changed

• Updated all dependencies and raised the minimum Rust version to 1.42. #1528
• Added more detail to error message when a preprocessor fails. #1526

... (truncated)

Commits

• 14add9c Merge pull request #1615 from ehuss/release-next
• 87877a9 Update to 0.4.11
• 2cf00d0 Merge pull request #1597 from ehuss/update-hightlight.js
• 8c7af3c Merge pull request #1614 from joshrotenberg/code_of_conduct
• 6dd785e Update to highlight.js 11.0.
• 8d131b4 Merge pull request #1598 from ehuss/update-contributing
• 97b3806 Merge pull request #1613 from FWYongxing/master
• d23734f add explicit code of conduct, copying other rust-lang repos
• 2ccfaad Merge pull request #1609 from joshrotenberg/intro_updates
• 3d04e5c Merge pull request #1612 from joshrotenberg/update_tokio_warp
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #21.