Downgrade RoundRobinAssigner to version 0 so that MemberMetadata adheres to the standard embedded schema
Downgrade RoundRobinAssigner to version 0 so that MemberMetadata adheres to the standard embedded schema

https://github.com/tulios/kafkajs/issues/1449

tulios/kafkajs,tulios/kafkajs,tulios/kafkajs,tulios/kafkajs