Update pytest from 3.3.1 to 3.4.0
Update pytest from 3.3.1 to 3.4.0
wagnerand/amo-validator,wagnerand/amo-validator,mozilla/amo-validator,wagnerand/amo-validator,mozilla/amo-validator,wagnerand/amo-validator,mozilla/amo-validator,mozilla/amo-validator