CI against Ruby 2.2.9/2.3.6/2.4.3/2.5.0/JRuby 9.1.16.0 #403
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Ruby 2.2.9/2.3.6/2.4.3/2.5.0/JRuby 9.1.16.0 has been released. And update README.
https://www.ruby-lang.org/en/news/2017/12/14/ruby-2-2-9-released/
https://www.ruby-lang.org/en/news/2017/12/14/ruby-2-3-6-released/
https://www.ruby-lang.org/en/news/2017/12/14/ruby-2-4-3-released/
https://www.ruby-lang.org/en/news/2017/12/25/ruby-2-5-0-released/
http://jruby.org/2018/02/21/jruby-9-1-16-0