Updated the summary to be more like chpasswd/chsh.
Updated the summary to be more like chpasswd/chsh.

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