Change log:
6cfa226 Upgrade versions; prepare for release
3a87c5e GH-2000: Doc RetryTopic Publish with Deser. Errors
3da65a8 GH-2001: Propagate Exception from TX Sync Commit
1361a36 GH-2003: Fix RetryableTopic Delivery Attempts Hdr
6ed0b2e GH-1994: Fix Typos in Doc
9159ef9 GH-1994: Option to Strip Exception Headers
afc2883 Fix JavaDoc
c1f8668 Add nullable annotation on ContainerProperties.transactionManager getter/setter
c76e86f GH-1983: Support copy of producer factory