Update note about Spork usage
Update note about Spork usage

Readme suggested a deprecated path for requiring rspec_integration with Spork
mallikarjunayaddala/draper,jianyuan/draper,baberthal/draper,donaldpiret/draper,turingschool/draper,drapergem/draper,krainboltgreene/draper,outstand/draper,Bastes/draper,sideci-sample/sideci-sample-draper,jianyuan/draper,baberthal/draper,Bastes/draper,totzyuta/draper,totzyuta/draper,SpencerCDixon/draper,drapergem/draper,turingschool/draper,drapergem/draper,liwangbest/draper,chuck-john/draper,yui-knk/draper,mallikarjunayaddala/draper,liwangbest/draper,estum/draper,chuck-john/draper,outstand/draper,estum/draper,SpencerCDixon/draper,yui-knk/draper