Added an example for installing via homebrew.
Added an example for installing via homebrew.

postmodern/chruby,kbrock/chruby,eunomie/chgo,JeanMertz/chruby-fish,ngpestelos/chruby,rstacruz/chruby-fish,ngpestelos/chruby,kbrock/chruby,JeanMertz/chruby-fish,rstacruz/chruby-fish,regularfry/chruby,postmodern/chruby,regularfry/chruby,ilikepi/chruby,ilikepi/chruby,eunomie/chgo