Added

Support for forking and running arbitrary functions (so-called “fork functions”). (#127, #230)
The --fork-function flag.
The --skip-logging flag. (#263, @whalesalad)

Fixed

An issue where the max_age parameter to Callbacks was being ignored. (#240, @evstratbg)
An issue with delaying pipelines. (#264, @synweap15)
An issue where the master process would sometimes hang when stopped. (#260, @asavoy)
An issue where the RedisBroker could sometimes prefetch more messages than it was configured to. (#262, @benekastah)
The StubBroker now flushes its dead letter queue when its flush_all method is called. (#247, @CapedHero)
The RedisBroker now takes the max lua stack size into account. This should fix certain heisenbugs that folks have encountered with that broker. (#259, @benekastah)