Merge pull request confluentinc#600 from confluentinc/import_v1.6.1

Import v1.6.1

Merge pull request confluentinc#600 from confluentinc/import_v1.6.1

Import v1.6.1

Merge pull request confluentinc#562 from confluentinc/import_v1.5.2

Import v1.5.2

Merge pull request confluentinc#464 from confluentinc/import_v1.4.2

librdkafka static bundle v1.4.2

Merge pull request confluentinc#449 from confluentinc/import_v1.4.0

librdkafka static bundle v1.4.0

Merge pull request confluentinc#449 from confluentinc/import_v1.4.0

librdkafka static bundle v1.4.0

Bump librdkafka requirement to 1.3.0.

Bump librdkafka requirement to v1.1.0

Bump librdkafka requirement to v1.1.0

doc: Fix typo (@KimMachineGun, confluentinc#314)