Bump rdoc from 4.2.2 to 6.0.2

[dependabot-preview]

Bumps rdoc from 4.2.2 to 6.0.2.

Changelog

Sourced from rdoc's changelog.

=== 5.1.0 / 2017-02-24

• Bug fixes

  • Fix an issue that rdoc fails when running on Windows with RUBYOPT=-U.
    PR #430 by Toshihiko Ichida

• Minor enhancements

  • Parse ruby 2.1 def. PR #436 by Akira Matsuda.
  • Suppress warnings in eval. PR #440 by Nobuyoshi Nakada.

=== 5.0.0 / 2016-11-05

• Major enhancements

  • Cleanup deprecated code targeted Ruby 1.8

• Bug fixes

  • Ensure badge data is included in result of JsonIndex template.
  • Ensure items in the nil section are displayed in HTML output. Issue #399
    by Daniel Svensson.
  • Parse rb_intern_const correctly in C. PR #381 by Sho Hashimoto.
  • Fix broken assets caused by #335 when serving ri. PR #360 by Alex Wood.
  • Don't try to parse svg files. Issue #350 by Sigurd Svela.

• Minor enhancements

  • Improve class name expansion/resolution in ri. PR #400 by NARUSE, Yui
  • Improve performance of document generation. PR #397 by Yusuke Endoh.

=== 4.3.0 / 2016-11-04

• Minor enhancements
  • Removed json dependency for Ruby 2.4.0
  • End to support Ruby 1.8.x

=== 4.2.2 / 2016-02-09

• Bug fixes
  • Include lib/rdoc/generator/pot/* in built gem

=== 4.2.1 / 2015-12-22

• Bug fixes
  • Fixed infinite loop with CR #339 by nobu
  • Allow rdoc run with --disable-gems #340 by luizluca
  • Don't store full path in GZipped js files #341 by voxik
  • Fix relative path names for drive letters #367 by nobu
  • Fix for valid syntax class C end parsing #368 by nobu

=== 4.2.0 / 2014-12-06
... (truncated)

Commits

• 67b3959 Bump version to 6.0.2
• 22cbdbc Remove lib/rdoc/test_case.rb from s.files
• 32d9a92 Escape source_name parameter on RDoc::Servlet.
• 00d6061 Merge pull request #604 from aycabta/use-jruby-9.1.16.0
• 31aad57 Use JRuby 9.1.16.0
• 0526d97 Merge pull request #603 from aycabta/override-dot_doc-by-exclude-option
• b9265b5 Override .document setting by --exclude option
• 30b7109 Remove RDoc::RDoc#exclude
• 81522d7 Merge pull request #602 from ruby/remove-date
• 73aed3f Remove date field from gemspec.
• Additional commits viewable in compare view

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Superseded by #129.