Bumps redcarpet from 3.3.4 to 3.5.1.

Sourced from redcarpet's releases.

Redcarpet v3.5.1

Fix a security vulnerability using :quote in combination with the :escape_html option.

Reported by Johan Smits.

v3.5.0

This release mostly ships with bug fixes and tiny improvements.

Improvements

• Avoid mutating the options hash passed to a render object (See #663).

• Automatically enable the fenced_code_blocks option passing a HTML_TOC object to the Markdown object's constructor since some languages rely on the sharp to comment code (See #451).

• Remove the rel and rev attributes from the output generated for footnotes as they don't pass the HTML 5 validation (See #536).

• Allow passing Range objects to the nesting_level option to have a higher level of customization for table of contents (See #519):

  Redcarpet::Render::HTML_TOC.new(nesting_level: 2..5)

Bug fixes

• Fix a segfault rendering quotes using StripDown and the :quote option.

• Fix SmartyPants single quotes right after a link. For example:

  [John](http://john.doe)'s cat

  Will now properly converts ' to a right single quote (i.e. ’).

v3.4.0

Redcarpet v3.4.0

This new release ships with a bunch of bug fixes especially regarding anchor generation.

Improvements to anchor generation

The anchor generation now relies on a djb2 hashing algorithm whenever the generated anchor is empty as non alpha-numeric chars. This is specifically interesting for CJK contents as Redcarpet used to generate empty anchors dealing with titles in these locales.

Special thanks to Alexey Kopytko and namusyaka for their work on that !

Also now, the html-escaped entities are removed from anchors generated with the HTML render in order to be consistent with the HTML_TOC render and as it is more expected.

Other improvements

• Table headers don't require a minimum of three dashes anymore; a single one can be used for each row.
• The Markdown and rendering options are now exposed through a Hash inside the @options instance variable inside your custom render objects.

Bug fixes

... (truncated)

Sourced from redcarpet's changelog.

Version 3.5.1 (Security)

• Fix a security vulnerability using :quote in combination with the :escape_html option.

  Reported by Johan Smits.

Version 3.5.0

• Avoid mutating the options hash passed to a render object.

  Refs #663.

  Max Schwenk

• Fix a segfault rendering quotes using StripDown and the :quote option.

  Fixes #639.

• Fix warning: instance variable @options not initialized when running under verbose mode (-w, $VERBOSE = true).

• Fix SmartyPants single quotes right after a link. For example:

  [John](http://john.doe)'s cat

  Will now properly converts ' to a right single quote (i.e. ’).

  Fixes #624.

• Remove the rel and rev attributes from the output generated for footnotes as they don't pass the HTML 5 validation.

  Fixes #536.

• Automatically enable the fenced_code_blocks option passing a HTML_TOC object to the Markdown object's constructor since some languages rely on the sharp to comment code.

  Fixes #451.

• Allow passing Range objects to the nesting_level option to have a higher level of customization for table of contents:

  Redcarpet::Render::HTML_TOC.new(nesting_level: 2..5)

... (truncated)

• a699c82 Fix a security issue using :quote with :escape_html
• 6270d6b Redcarpet v3.5.0
• 94f6e27 Tiny follow-up to #663
• 3100f65 Merge pull request #663 from maschwenk/dont-mutate-options
• fc52d9c Add regression test
• 03e7997 Don't mutated passed options
• 92a7b3a Fix a segfault with StripDown and the :quote option
• 7352162 Merge pull request #649 from rbalint/master
• e23383e Merge pull request #650 from kolen/fix-warning-options-not-initialized
• 6b86656 Fix "instance variable @options not initialized" warning
• Additional commits viewable in compare view

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