* ext/psych/psych.gemspec: ditto * ext/psych/yaml/scanner.c: add latest libyaml change. * test/psych/helper.rb: support newer minitest * test/psych/test_to_yaml_properties.rb: ditto git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49632 b2dd03c8-39d4-4d8f-98ff-823fe69b080e