Mention `hash -r` in the README.
Mention `hash -r` in the README.

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