Change log:
f6880db Upgrade versions; prepare for release
0c5346c Javadoc Polishing
7bfc6b7 GH-1646 Clear lastCommits after fixTxOffset
fa8cbeb Don't cache tx producers after reset()
a306c58 GH-1643: Add More ConsumerStoppedEvent.Reasons
1118056 GH-1641: Reconfigurable Producer Factory
