build(deps): update pulldown-cmark requirement from 0.4 to 0.5

[dependabot-preview]

Updates the requirements on pulldown-cmark to permit the latest version.

Release notes

Sourced from pulldown-cmark's releases.

0.5

Additions:

• CommonMark 0.29 compatibility
• SIMD accelerated parsers feature
• Guards against known pathological inputs causing quadratic scanning time
• Speed improvements

Changes:

• Code spans are no longer tags, but are now events contain a single CowStr. This is a breaking change.

Commits

• f525f93 Merge pull request #276 from marcusklaas/readme
• 8d92f39 Touch up documentation
• 6ff71f8 Bump version to 0.5; update dependencies
• 1a03f82 Add warning about calling write_html with unbuffered writers
• a2af999 Add note about simd feature to readme
• 86a7bf1 Merge pull request #275 from marcusklaas/cmark0.29
• b526349 Revert minor chnage in scan_entity
• 1e03371 Match emphasis delims when both are multiples of 3
• 03a043a Do a proper upgrade of the spec text
• 1d5f6e0 Don't retry plain link dest scan after pointy fails
• Additional commits viewable in compare view

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[igor-raits]

@mgeisler merge pls

[mgeisler]

Hi @ignatenkobrain, I see that pulldown-cmark version 0.5 and later cannot compile with Rust 2018. As I just wrote in #79, I would like to stay with Rust 2018 for now.

The version-sync crate doesn't seem to need any new features from the newer versions of pulldown-cmark?

[dependabot-preview]

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.