TL;DR
Bunny 1.2.1 is released to rubygems.org.
This is a bug fix release.
Changes between Bunny 1.2.0 and 1.2.1
Better Synchronization for Publisher Confirms
Publisher confirms implementation now synchronizes unconfirmed set better.
Contributed by Nicolas Viennot.
Channel Allocation After Recovery
Channel id allocator is no longer reset after recovery if there are channels open. Makes it possible to open channels on a recovered connection (in addition to the channels it already had).
Full Change Log
Full change log can be found on GitHub.
About the Author
Michael on behalf of the Ruby RabbitMQ Clients Team