update HISTORY for 0.0.6.2
update HISTORY for 0.0.6.2

nmathewson/mixminion,Javex/mixminion,crooks/mixminion,Javex/mixminion,reezer/mixminion,mixminion/mixminion,nmathewson/mixminion,Javex/mixminion,rxcomm/mixminion,rxcomm/mixminion,crooks/mixminion,Javex/mixminion,nmathewson/mixminion,mixminion/mixminion,rxcomm/mixminion,reezer/mixminion,mixminion/mixminion,rxcomm/mixminion,reezer/mixminion,crooks/mixminion,reezer/mixminion,mixminion/mixminion,crooks/mixminion,nmathewson/mixminion