Update pytest from 3.7.4 to 3.8.0 (#3846)
Update pytest from 3.7.4 to 3.8.0 (#3846)


flodolo/testpilot,mozilla/idea-town,mozilla/idea-town-server,flodolo/testpilot,mozilla/idea-town,mozilla/idea-town-server,mozilla/idea-town-server,mozilla/idea-town-server,flodolo/testpilot,flodolo/testpilot,mozilla/idea-town,mozilla/idea-town