Update mistune requirement from <=0.8.4 to <2.0.5

[dependabot[bot]]

Updates the requirements on mistune to permit the latest version.

Changelog

Sourced from mistune's changelog.

Changelog

Here is the full history of mistune v2.

Version 2.0.4

Released on Jul 15, 2022

Fix url plugin in <a> tag
Fix * formatting

Version 2.0.3

Released on Jun 27, 2022

• Fix table plugin
• Security fix for CVE-2022-34749

Version 2.0.2

Released on Jan 14, 2022
Fix escape_url
Version 2.0.1

Released on Dec 30, 2021

XSS fix for image link syntax.

Version 2.0.0

Released on Dec 5, 2021
This is the first non-alpha release of mistune v2.
Version 2.0.0rc1

Released on Feb 16, 2021

Version 2.0.0a6

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Commits

• b92a5fe Version bump 2.0.4
• 98a1c0a Fix url plugin render, #308
• 979d6d3 Fix * parsing, #312
• f857f04 Trigger GitHub dependency graph
• 3f422f1 Version bump 2.0.3
• a6d4321 Fix asteris emphasis regex CVE-2022-34749
• 5638e46 Merge pull request #307 from jieter/patch-1
• 0eba471 Fix typo in guide.rst
• 61e9337 Fix table plugin
• 76dec68 Add documentation for renderer heading when TOC enabled
• Additional commits viewable in compare view

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