v2.2.0

This is a feature release.

Enhancements

• References librdkafka.redist 2.2.0. Refer to the librdkafka v2.2.0 release notes for more information.
• KIP-339
  IncrementalAlterConfigs API (#2005).
• KIP-554:
  User SASL/SCRAM credentials alteration and description (#2070).

Fixes

• Fix backwards compatability of TopicPartitionOffset constructor. (drinehimer, #2066)
• Fix IConsumer breaking change. (ttd2089, #2071)