remove no longer used set_offset
remove no longer used set_offset

alfred-landrum/node-kafka-native,alfred-landrum/node-kafka-native,alfred-landrum/node-kafka-native,alfred-landrum/node-kafka-native,jut-io/node-kafka-native,jut-io/node-kafka-native,jut-io/node-kafka-native,alfred-landrum/node-kafka-native,jut-io/node-kafka-native,jut-io/node-kafka-native