Update attrs from 17.4.0 to 18.1.0 (#3532)
Update attrs from 17.4.0 to 18.1.0 (#3532)


fzzzy/testpilot,flodolo/testpilot,lmorchard/idea-town-server,lmorchard/testpilot,mozilla/idea-town,mozilla/idea-town-server,mozilla/idea-town,meandavejustice/testpilot,flodolo/testpilot,chuckharmston/testpilot,meandavejustice/testpilot,mozilla/idea-town,lmorchard/idea-town,lmorchard/idea-town,lmorchard/testpilot,lmorchard/testpilot,meandavejustice/testpilot,mozilla/idea-town-server,lmorchard/idea-town,chuckharmston/testpilot,mozilla/idea-town-server,chuckharmston/testpilot,lmorchard/idea-town-server,lmorchard/idea-town-server,mozilla/idea-town-server,meandavejustice/testpilot,mozilla/idea-town,fzzzy/testpilot,fzzzy/testpilot,lmorchard/testpilot,chuckharmston/testpilot,flodolo/testpilot,lmorchard/idea-town-server,lmorchard/idea-town,flodolo/testpilot,fzzzy/testpilot