update travis.yml
update travis.yml

mackerelio/mackerel-agent,yyljlyy/mackerel-agent,kamatama41/mackerel-agent,moznion/mackerel-agent,stanaka/mackerel-agent,kamatama41/mackerel-agent,yyljlyy/mackerel-agent,moznion/mackerel-agent,stanaka/mackerel-agent,stanaka/mackerel-agent,yyljlyy/mackerel-agent,stanaka/mackerel-agent,moznion/mackerel-agent,kamatama41/mackerel-agent,yyljlyy/mackerel-agent,mackerelio/mackerel-agent,kamatama41/mackerel-agent,moznion/mackerel-agent,mackerelio/mackerel-agent