Update README: zf1 => zf2
Update README: zf1 => zf2

svrdlic/Geocoder,stof/Geocoder,tylerhebel/Geocoder,svrdlic/Geocoder,Nyholm/Geocoder,jollysean/Geocoder,arunlodhi/Geocoder,misterion/Geocoder,Nyholm/Geocoder,shamyyl/Geocoder,heatery/Geocoder,mubassirhayat/Geocoder,collmomo/Geocoder,geocoder-php/Geocoder,geocoder-php/Geocoder,xabbuh/Geocoder,ankr/Geocoder,Koc/Geocoder,pecopeco/Geocoder,fluxoft/Geocoder,jmcclell/Geocoder