（如何快速刷版本号？只需要改版本号就好了）
http://jruby.org/2015/07/22/jruby-9-0-0-0.html
特性
- Ruby 2.2 compatibility
- A new optimizing runtime based on a traditional compiler design
- New POSIX-friendly IO and Process
- Fully ported encoding/transcoding logic from MRI
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