confluent-kafka-python v2.1.1

v2.1.1 is a maintenance release with the following fixes and enhancements:

Fixes

• Added a new ConsumerGroupState UNKNOWN. The typo state UNKOWN is deprecated and will be removed in the next major version.
• Fix some Admin API documentation stating -1 for infinite timeout incorrectly.
  Request timeout can't be infinite.

confluent-kafka-python is based on librdkafka v2.1.1, see the
librdkafka release notes
for a complete list of changes, enhancements, fixes and upgrade considerations.