used container based travis builds
used container based travis builds

lins05/slackbot,merqurio/slackbot,kave/zenhub-slackbot,kave/zenhub-slackbot,foresterh/slackbot,grantvix/images,TimZehta/slackbot,pengzhangdev/slackbot,merqurio/slackbot,foresterh/slackbot,pengzhangdev/slackbot,TimZehta/slackbot,lins05/slackbot