Fix README.rdoc to README.md in the gemspec
Fix README.rdoc to README.md in the gemspec

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