Update rdoc requirement from ~> 3.12 to ~> 6.2

[dependabot-preview]

Updates the requirements on rdoc to permit the latest version.

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

• 6bd3ec3 Remove jquery.js
• b8576f9 Version 6.2.0
• 5ffedc0 lib/rdoc/store.rb: Use Marshal.dump(obj, io)
• 1d7cf02 lib/rdoc/parser/ruby.rb: Avoid .chars.to_a.last
• ec367c0 lib/rdoc/markup/parser.rb: remove a unused variable initialization
• b6206b9 Good bye jQuery
• 6f145a5 Merge pull request #740 from aycabta/remove-ci-files-from-list
• 340658f Remove CI files from list
• 4efa1a7 Merge pull request #739 from aycabta/remove-travis-workaround
• 40092e0 Merge pull request #737 from ruby/remove-testcase-from-lib
• Additional commits viewable in compare view

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