Update compatibility notice.
Update compatibility notice.

Add Rails 4 and Ruby 2.

guavapass/geocoder,TrangPham/geocoder,brian-ewell/geocoder,3mundi/geocoder,davydovanton/geocoder,gogovan/geocoder-olleh,mveer99/geocoder,ivanzotov/geocoder,aceunreal/geocoder,malandrina/geocoder,FanaHOVA/geocoder,rios1993/geocoder,eugenehp/ruby-geocoder,sjaveed/geocoder,rayzeller/geocoder,mdebo/geocoder,sr-education/geocoder,moofish32/geocoder,andreamazz/geocoder,alexreisner/geocoder,ankane/geocoder,tiramizoo/geocoder,jgrciv/geocoder,mehlah/geocoder,donbobka/geocoder,tortuba/geocoder,Devetzis/geocoder,rdlugosz/geocoder,epyatopal/geocoder,sideci-sample/sideci-sample-geocoder,boone/geocoder,jaigouk/geocoder-olleh,AndyDangerous/geocoder,gogovan/geocoder-olleh,jaigouk/geocoder-olleh,StudioMelipone/geocoder,crdunwel/geocoder,GermanDZ/geocoder