confluent-kafka-go v1.8.2

This is a maintenance release:

• Bundles librdkafka v1.8.2
• Check termination channel while reading delivery reports (by @zjj)
• Added convenience method Consumer.StoreMessage() (@finncolman, #676)

confluent-kafka-go is based on librdkafka v1.8.2, see the librdkafka release notes
for a complete list of changes, enhancements, fixes and upgrade considerations.

Note: There were no confluent-kafka-go v1.8.0 and v1.8.1 releases.