2.3.0
You can easily install it through the Ruby Version Manager - RVM. Instructions on how to do it can be found at http://rvm.io
It is expected to work with rubies 2.2.2 and above.
NOTE: If you are using the gnome-shell, or any derivate like terminator, you have to mark on your profile the option to use a "login bash".
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Gem installation:
bundle install
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Alternatively you can just run the setup script:
bin/setup
rake