Fix 'rake rdoc' task after renaming README to README.rdoc.
Fix 'rake rdoc' task after renaming README to README.rdoc.

jaigouk/geocoder-olleh,crdunwel/geocoder,eugenehp/ruby-geocoder,kerrizor/geocoder,ankane/geocoder,ivanzotov/geocoder,mehlah/geocoder,malandrina/geocoder,FanaHOVA/geocoder,sideci-sample/sideci-sample-geocoder,mdebo/geocoder,rayzeller/geocoder,boone/geocoder,brian-ewell/geocoder,GermanDZ/geocoder,jgrciv/geocoder,aceunreal/geocoder,gogovan/geocoder-olleh,AndyDangerous/geocoder,jaigouk/geocoder-olleh,Devetzis/geocoder,guavapass/geocoder,rios1993/geocoder,andreamazz/geocoder,rdlugosz/geocoder,StudioMelipone/geocoder,epyatopal/geocoder,3mundi/geocoder,TrangPham/geocoder,donbobka/geocoder,mveer99/geocoder,sr-education/geocoder,moofish32/geocoder,0livier/geocoder,gogovan/geocoder-olleh,alexreisner/geocoder,tiramizoo/geocoder,nerdyglasses/geocoder,sjaveed/geocoder,davydovanton/geocoder,john/geocoder,jonathanleone/geocoder,tortuba/geocoder