Add apt-get update to travis config
Add apt-get update to travis config

chaozh/logcabin,chaozh/logcabin,dankenigsberg/logcabin,TigerZhang/logcabin,gaoning777/logcabin,dankenigsberg/logcabin,gaoning777/logcabin,logcabin/logcabin,gaoning777/logcabin,logcabin/logcabin,TigerZhang/logcabin,tempbottle/logcabin,gaoning777/logcabin,chaozh/logcabin,tempbottle/logcabin,TigerZhang/logcabin,TigerZhang/logcabin,tempbottle/logcabin,dankenigsberg/logcabin,chaozh/logcabin,dankenigsberg/logcabin,logcabin/logcabin,logcabin/logcabin,tempbottle/logcabin