* Update bundled libyaml-0.2.1 from 0.1.7. https://github.com/ruby/psych/pull/368 * Unify Psych's API: To use keyword arguments with method call. https://github.com/ruby/psych/pull/358 git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64544 b2dd03c8-39d4-4d8f-98ff-823fe69b080e