v1.3.19

Reactor Kafka 1.3.19 is part of 2020.0.34 Release Train.

What's Changed

• GH-349: Eagerly Initialize Transactional Producers by @garyrussell in #350
• GH-344: ReceiverPartition Improvements by @garyrussell in #351
• Switch to Core SNAPSHOT; Upgrade kafka-clients by @garyrussell in #353

Full Changelog: v1.3.18...v1.3.19