Update ruby version to 2.4.0.
Update ruby version to 2.4.0.

ricardorsierra/dotfiles,unicell/dotfiles,jesperronn/cowboy-dotfiles,CodisRedding/dotfiles,drzax/dotfiles,CodisRedding/dotfiles,unicell/dotfiles,montyubuntu/dotfiles,whizzzkid/dotfiles,whizzzkid/dotfiles,austinrivas/dotfiles,montyubuntu/dotfiles,montyubuntu/dotfiles,junjizhi/dotfiles-1,CodisRedding/dotfiles,jesperronn/cowboy-dotfiles,davestephens/dotfiles,junjizhi/dotfiles-1,tkruse/dotfiles,cowboy/dotfiles,junjizhi/dotfiles-1,davestephens/dotfiles,ricardorsierra/dotfiles,jesperronn/cowboy-dotfiles,ricardorsierra/dotfiles,unicell/dotfiles,CodisRedding/dotfiles,davestephens/dotfiles,montyubuntu/dotfiles,drzax/dotfiles,ricardorsierra/dotfiles,drzax/dotfiles,ekilmer/dotfiles,tkruse/dotfiles,davestephens/dotfiles,jesperronn/cowboy-dotfiles,cowboy/dotfiles,unicell/dotfiles,austinrivas/dotfiles,whizzzkid/dotfiles,whizzzkid/dotfiles,ekilmer/dotfiles,cowboy/dotfiles,cowboy/dotfiles,ekilmer/dotfiles,junjizhi/dotfiles-1