* lib/yaml.rb: [DOC] Add links to syck and psych on github [Bug #9501]
  Based on a patch by Giorgos Tsiftsis [ci skip]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44893 b2dd03c8-39d4-4d8f-98ff-823fe69b080e