Update github-markup requirement from ~> 1.3 to ~> 3.0

[dependabot-preview]

Updates the requirements on github-markup to permit the latest version.

Release notes

Sourced from github-markup's releases.

v3.0.1

• Remove linguist-detected RMarkdown files from the Markdown renderer #1237

Changelog

Sourced from github-markup's changelog.

3.0.1 - 2018-10-19

• Remove linguist-detected RMarkdown files from the Markdown renderer #1237

3.0.0 - 2018-10-18

• Allow passing options through to CommonMarker #1236
• Symlink option is now a keyword arg #1236

2.0.2 - 2018-10-15

• Don't render rmd files as Markdown #1235

2.0.1 - 2018-06-29

• Create anchor for every =item directive in POD files #1165

2.0.0 - 2018-01-31

• Remove filesystem access #1157

1.7.0 - 2018-01-30

Changed

• Updates for Linguist v6 #1139
• Update to Nokogiri ~> 1.8; drop support for Ruby 2.0 #1156

1.6.2 - 2017-11-27

Changed

• Only report basename in usage #1131
• rest2html parameter signature fix #1082

1.6.1 - 2017-07-25

Changed

• Added support for highlight directive in rST #925
• Fixes to documentation and code style #1009 #1071 #1087
• Test against newer Ruby versions #1086
• Upgrade to Asciidoctor 1.5.6.1 #1088

1.6.0 - 2017-04-03

Changed

• Added filename argument to all renderers for additional context
• Removed superfluous rinku dependency #1035

... (truncated)

Commits

• See full diff in compare view

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[majormoses]

@dependabot-bot rebase

[dependabot-preview]

A newer version of github-markup exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.