fix URL of build status icon on README.rdoc
fix URL of build status icon on README.rdoc

varvet/kaminari,yui-knk/kaminari,sideci-sample/sideci-sample-kaminari,parity/kaminari,pat/kaminari,danimashu/kaminari,antstorm/kaminari,danimashu/kaminari,Boomkat/kaminari,thiagorp/kaminari,antstorm/kaminari,yui-knk/kaminari,bonekost/kaminari,bsboris/kaminari,barkbox/cursor,Zhomart/kaminari,jiamaozheng/kaminari,JuanitoFatas/kaminari,Zhomart/kaminari,sanrodari/kaminari,jiamaozheng/kaminari,dblock/kaminari,peter-umb/umbie_kaminari,mrhead/kaminari,joe1chen/kaminari,varvet/kaminari,sendgrid/kaminari,mperrando/kaminari,epicagency/kaminari,aelogica/kaminari,fkagami/kaminari,sachin21/kaminari,parity/kaminari,sr-education/kaminari,pat/kaminari,Teino1978-Corp/Teino1978-Corp-kaminari,JuanitoFatas/kaminari,aelogica/kaminari,kaminari/kaminari,sanrodari/kaminari,iberianpig/kaminari,onursarikaya/kaminari,bsboris/kaminari,sendgrid/kaminari,jcoyne/kaminari,wkirschbaum/kaminari,joe1chen/kaminari,Boomkat/kaminari,mrstif/cursor,sr-education/kaminari,epicagency/kaminari,thiagorp/kaminari,guodongme/kaminari,mrhead/kaminari,plribeiro3000/kaminari,amatsuda/kaminari,iberianpig/kaminari,guodongme/kaminari,dblock/kaminari,mperrando/kaminari,plribeiro3000/kaminari,wkirschbaum/kaminari,onursarikaya/kaminari,royels/kaminari,bonekost/kaminari,Teino1978-Corp/Teino1978-Corp-kaminari,royels/kaminari,sendgrid/kaminari,sachin21/kaminari,kaminari/kaminari,peter-umb/umbie_kaminari,amatsuda/kaminari