Bump jekyll from 3.8.7 to 3.9.0

[dependabot-preview[bot]]

Bumps jekyll from 3.8.7 to 3.9.0.

Release notes

Sourced from jekyll's releases.

v3.9.0

Minor Enhancements

• Allow use of kramdown v2 (#8322)
• Add default language for kramdown syntax highlighting (#8325)

Changelog

Sourced from jekyll's changelog.

3.9.0 / 2020-08-05

Minor Enhancements

• Allow use of kramdown v2 (#8322)
• Add default language for kramdown syntax highlighting (#8325)

Commits

• 8fe3a5d Release :gem: 3.9.0
• 331361a Update jekyll 3.9.0 release post
• 8681d67 Update history.markdown
• 917c7b1 [3.x] Add default language for kramdown syntax highlighting (#8325)
• a6e2193 [3.x] Add 3.9.0 release post (#8323)
• f98b249 Merge pull request #8322 from jekyll/3.9-kramdown-v2-upgrade
• 071913e Require kramdown-parser-gfm gracefully.
• 82fc6ba Update features/collections.feature
• 0ac94d7 Rewrite kramdown and rouge versions in script/default-site
• 5a2f8d7 Skip this scenario when using Kramdown v1 since it doesn't support guess_lang
• Additional commits viewable in compare view

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[perlun]

Will not be merged since we are migrating to sitegen, dismissing PR.

[dependabot-preview[bot]]

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.

[perlun]

@dependabot ignore this major version

[dependabot-preview[bot]]

OK, I won't notify you about version 3.x.x again, unless you re-open this PR or update to a 3.x.x release yourself.