added user name requirment to Client.new params and updated call from latest(depricated)  to latest_topics
added user name requirment to Client.new params and updated call from latest(depricated)  to latest_topics

oblakeerickson/discourse_api,RyzacInc/discourse_api,jmay/discourse_api,melissawahnish/discourse_api,techAPJ/discourse_api,maclover7/discourse_api,spatten/discourse_api,Odyl/discourse_api,thieunus/discourse_api,discourse/discourse_api