ruby-driver: update README
ruby-driver: update README

bigtreeljc/concourse,cinchapi/concourse,remiemalik/concourse,bigtreeljc/concourse,chiranjeevjain/concourse,chiranjeevjain/concourse,vrnithinkumar/concourse,remiemalik/concourse,karthikprabhu17/concourse,vrnithinkumar/concourse,kylycht/concourse,prateek135/concourse,JerJohn15/concourse,hcuffy/concourse,vrnithinkumar/concourse,kylycht/concourse,prateek135/concourse,Qunzer/concourse,chiranjeevjain/concourse,savanibharat/concourse,savanibharat/concourse,JerJohn15/concourse,kylycht/concourse,karthikprabhu17/concourse,karthikprabhu17/concourse,remiemalik/concourse,hcuffy/concourse,JerJohn15/concourse,hcuffy/concourse,savanibharat/concourse,remiemalik/concourse,savanibharat/concourse,kylycht/concourse,savanibharat/concourse,aabdin01/concourse,remiemalik/concourse,kylycht/concourse,cinchapi/concourse,Qunzer/concourse,karthikprabhu17/concourse,bigtreeljc/concourse,savanibharat/concourse,aabdin01/concourse,cinchapi/concourse,Qunzer/concourse,prateek135/concourse,Qunzer/concourse,cinchapi/concourse,vrnithinkumar/concourse,bigtreeljc/concourse,JerJohn15/concourse,vrnithinkumar/concourse,aabdin01/concourse,dubex/concourse,Qunzer/concourse,dubex/concourse,dubex/concourse,Qunzer/concourse,aabdin01/concourse,remiemalik/concourse,chiranjeevjain/concourse,bigtreeljc/concourse,hcuffy/concourse,karthikprabhu17/concourse,prateek135/concourse,dubex/concourse,cinchapi/concourse,chiranjeevjain/concourse,dubex/concourse,cinchapi/concourse,aabdin01/concourse,JerJohn15/concourse,JerJohn15/concourse,chiranjeevjain/concourse,dubex/concourse,kylycht/concourse,prateek135/concourse,bigtreeljc/concourse,karthikprabhu17/concourse,prateek135/concourse,aabdin01/concourse,hcuffy/concourse,vrnithinkumar/concourse,hcuffy/concourse