Update rdoc version from 5.0.0 to 5.0.1.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@67781 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Update rdoc version from 5.0.0 to 5.0.1.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@67781 b2dd03c8-39d4-4d8f-98ff-823fe69b080e