Update module russross/blackfriday/v2 to v2.1.0

This MR contains the following updates:

Package	Type	Update	Change
github.com/russross/blackfriday/v2	require	minor	v2.0.1 -> v2.1.0

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Release Notes

russross/blackfriday

v2.1.0

Compare Source

A minor release, mainly aimed at resolving ambiguity about the import path for blackfriday v2 and delivering minor fixes since last release:

• Committed to github.com/russross/blackfriday/v2 as the canonical import path for blackfriday v2. (Issue #​587)
• Reduced the amount of dependencies. (MRs #​509 and #​515)
• Added a SanitizedAnchorName function. (MR #​509)
• Added Node.IsContainer and Node.IsLeaf methods. (MR #​540)
• Fixed parsing of links that end with a double backslashes. (Issue #​510)
• Fixed an issue where fence length wasn't computed. (MR #​505)
• Improved the default value for the HTMLRendererParameters.FootnoteReturnLinkContents field. (MR #​547)

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