Update pytest from 3.1.2 to 3.1.3
Update pytest from 3.1.2 to 3.1.3
mozilla/amo-validator,mozilla/amo-validator,mozilla/amo-validator,wagnerand/amo-validator,wagnerand/amo-validator,wagnerand/amo-validator,mozilla/amo-validator,wagnerand/amo-validator