Update pytest from 3.0.7 to 3.1.0
Update pytest from 3.0.7 to 3.1.0
wagnerand/amo-validator,mozilla/amo-validator,mozilla/amo-validator,wagnerand/amo-validator,wagnerand/amo-validator,mozilla/amo-validator,wagnerand/amo-validator,mozilla/amo-validator