Ruby: version 2.2.0 Released !

 Ruby ver 2.2.0 installed.

$ sudo ☆☆☆ install libffi-devel
$ gem source --add https://tokyo-m.rubygems.org/

$ git clone https://github.com/rubygems/rubygems
$ cd rubygems
$ sudo ruby setup.rb

$ gem -v

2.4.5

$ cd /****/rbenv/plugins/ruby-build
$ git pull origin master

$ rbenv install --list

...

2.2.0

...

$ sudo  CONFIGURE_OPTS="--disable-install-rdoc --enable-shared" rbenv install 2.2.0
$ rbenv versions

$ sudo rbenv global 2.2.0

$ ruby -v
ruby 2.2.0p0 (2014-12-25 revision 49005)

$ sudo gem install bundler