build(deps): update syntect requirement from 3.3.0 to 4.0.0

[dependabot-preview[bot]]

Updates the requirements on syntect to permit the latest version.

Release notes

Sourced from syntect's releases.

Pure-Rust regex engine support!

Headline feature: pure-Rust fancy-regex engine option

Users can now opt in to a pure-Rust regex engine using Cargo features, making compilation easier in general. People experiencing difficulty compiling for Windows and Wasm should try switching to fancy-regex. Note this currently approximately halves highlighting speed.

See the Readme and #270 for details. Thanks to @robinst for implementing this!

Other changes

• Ability to generate CSS for a theme for use with classed HTML generation (won't always be correct) #274
• Don't generate empty spans in classed HTML #276
• Miscellaneous dependency bumps and cleanup

Breaking changes and upgrading

Upgrading should cause no errors for nearly all users. Users using more unusual APIs may have a small amount of tweaking to do.

• If you use default-features = false you may need to update your features to choose a regex engine
• A bunch of technically public APIs that I don't know if anyone uses changed due to the regex engine refactor, common uses shouldn't break

Changelog

Sourced from syntect's changelog.

Version 4.0.0 (2020-03-29)

Headline feature: pure-Rust fancy-regex engine option

Users can now opt in to a pure-Rust regex engine using Cargo features, making compilation easier in general. People experiencing difficulty compiling for Windows and Wasm should try switching to fancy-regex. Note this currently approximately halves highlighting speed.

See the Readme and #270 for details. Thanks to @robinst for implementing this!

Other changes

• Ability to generate CSS for a theme for use with classed HTML generation (won't always be correct) #274
• Don't generate empty spans in classed HTML #276
• Miscellaneous dependency bumps and cleanup

Breaking changes and upgrading

Upgrading should cause no errors for nearly all users. Users using more unusual APIs may have a small amount of tweaking to do.

• If you use default-features = false you may need to update your features to choose a regex engine
• A bunch of technically public APIs that I don't know if anyone uses changed due to the regex engine refactor, common uses shouldn't break

Version 3.3.0 (2019-09-22)

Bug fixes and new utilities

• Fixes multiple bugs
• Add RangedHighlightIterator
• Add as_latex_escaped util

Version 3.2.1 (2019-08-10)

• Bump onig dependency
• inconsequential patches

Version 3.2.0 (2019-03-09)

• Actually make tokens_to_classed_spans public like intended

Version 3.1.0 (2019-02-24)

Metadata and new classed HTML generation

• Add support for loading metadata (#223 #225 #230)
• Improve support for generating classed HTML and fix a bug, old function is deprecated because it's impossible to use correctly (#235)
• Update plist to v0.4 and pretty_assertions to v0.6 (#232 #236)

... (truncated)

Commits

• 36c9116 Bump to v4.0.0
• c0efc8c Merge pull request #270 from trishume/move-regex-use-to-module
• 9cbe524 Add section to Readme about new fancy-regex mode.
• da2d4b5 Make packs to fix html::tests::strings test for fancy
• 0a74d87 Test fancy-regex mode in CI
• 4f09143 Only load regex module for features that need it
• a7045b1 Bump fancy-regex to 0.3.2
• fa92de0 Remove special treatment of look-behind
• 62d79e7 Fix rewriting of "newlines" mode regexes
• d8eeff9 Fix code that skips a character to work with unicode
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Looks like syntect is up-to-date now, so this is no longer needed.