0.2.0 -- Essential Bug Fixes, Compression

Breaking Changes

• Record::{key,value} are now optional, following the underlying Kafka protocol (#93)
• compression support, PartitionClient::produce requires compression parameter (#82, #91, #92, #94)
• PartitionClient::get_high_watermark was replaced by PartitionClient::get_offset (#100)
• StreamConsumer::new start_offset parameter changed from i64 to StartOffset type (#104)
• rework features (#107)

Features

• record deletion (#97)

Bug Fixes

• ignore InvalidReplicationFactor (#106)
• fix rare panic in BatchProducer (#105)
• filter out records that were not requested (#99)
• terminate consumer stream on OffsetOutOfRange (#96)

Performance

• faster CRC calculation (#85)