Release 2.1.1 (February 6, 2019) Milestone#28 Introducing SHUT_DOWN_STARTED state for the WorkerStateChangeListener. PR#457 Fixed a bug with AWSSessionCredentials using AWSSecretID instead of AWSAccessID and vice versa. PR#486 Upgrading SDK version to 2.4.0, which includes a fix for a possible deadlock when using Enhanced Fan-Out. PR#493