Bump Markdig from 0.30.4 to 0.31.0

[dependabot[bot]]

Bumps Markdig from 0.30.4 to 0.31.0.

Release notes

Sourced from Markdig's releases.

0.31.0

Changes

✨ New Features

• Add Contributing Docs (PR #674) by @​wbaldoumas

🐛 Bug Fixes

• Fix incorrect setext heading source span (PR #696) by @​artempyanykh

🚀 Enhancements

• Option to set controls attribute for MediaLinks (PR #672) by @​LukeTOBrien
• Allow YAML front matter in the middle of the document (PR #701) by @​yufeih

🧰 Misc

• Copyedit the grid table extension documentation (PR #678) by @​waldyrious
• Drop netcoreapp3.1 target (PR #685) by @​iamcarbon
• Bump .NET framework target to net462 (PR #690) by @​iamcarbon
• Enable ImplictUsings and use file-scoped namespaces (PR #693) by @​iamcarbon
• Update specs (8155a1e3)

Full Changelog: 0.30.4...0.31.0

Published with dotnet-releaser

Commits

• 8155a1e Update specs
• 0a16724 Merge pull request #701 from yufeih/yufeih/yamlfrontmatter
• 9df67b7 Allow YAML front matter in the middle of the document
• 8f8a145 Merge pull request #696 from artempyanykh/fix-setext-span
• a6cd283 Fix incorrect setext heading source span
• 851713f Merge pull request #693 from carbon/fsn2
• 9422764 [Markdig] Use global usings
• 74f978e [Markdig] Use file-scoped namespaces
• 66aaffa [mctoc] Enable ImplictUsings and use file-scoped namespaces
• a18d8de [UnicodeNormDApp] Enable ImplictUsings and use file-scoped namespaces
• Additional commits viewable in compare view

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