Update rdoc requirement from ~> 2.4 to ~> 3.12

[dependabot[bot]]

Updates the requirements on rdoc to permit the latest version.

Changelog

Sourced from rdoc's changelog.

=== 3.12.1 / 2013-02-05

• Bug fixes
  • Fixed an XSS exploit in darkfish.js. This could lead to cookie disclosure to third parties. See CVE-2013-0256[rdoc-ref:CVE-2013-0256.rdoc] for full details including a patch you can apply to generated RDoc documentation.
  • Ensured that rd parser files are generated before checking the manifest.

=== 3.12 / 2011-12-15

• Minor enhancements

  • Added DEVELOPERS document which contains an overview of how RDoc works and how to add new features to RDoc.
  • Improved title for HTML output to include --title in the title element.
  • rdoc --pipe now understands --markup.
  • RDoc now supports IRC-scheme hyperlinks. Issue #83 by trans.

• Bug fixes

  • Fixed title on HTML output for pages.
  • Fixed parsing of non-indented HEREDOC.
  • Fixed parsing of %w[] and other % literals. Issue #84 by Erik Hollensbe
  • Fixed arrow replacement in HTML output munging the spaceship operator. Issue #85 by eclectic923.
  • Verbatim sections with ERB that match the ruby code whitelist are no longer syntax-highlighted. Issue #86 by eclectic923
  • Line endings on windows are normalized immediately after reading with binmode. Issue #87 by Usa Nakamura
  • RDoc better understands directives for comments. Comment directives can now be found anywhere in multi-line comments. Issue #90 by Ryan Davis
  • Tidy links to methods show the label again. Issue #88 by Simon Chiang
  • RDoc::Parser::C can now find comments directly above +rb_define_class_under+. Issue #89 by Enrico
  • In rdoc, backspace and ansi formatters, labels and notes without bodies are now shown.
  • In rdoc, backspace and ansi formatters, whitespace between label or note and the colon is now stripped.

=== 3.11 / 2011-10-17

• Bug fixes
  • Avoid parsing TAGS files included in gems. Issue #81 by Santiago Pastorino.

=== 3.10 / 2011-10-08

• Major enhancements
  • RDoc HTML output has been improved:
    • The search from Володя Колесников's (Vladimir Kolesnikov) SDoc has been

... (truncated)

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