Include bash-completion setup step for OSX to README
Include bash-completion setup step for OSX to README

mbailey/credulous,realestate-com-au/credulous,realestate-com-au/credulous,mefellows/credulous,mbailey/credulous,mbailey/credulous,mefellows/credulous,realestate-com-au/credulous,mefellows/credulous,mefellows/credulous,realestate-com-au/credulous,mbailey/credulous