Allow to use Sentinel for Redis connections. New variablesentinel can bepassed to Redis jobboard. It is None by default, Sentinel name should be passedto enable this functionality.

Limit retries for storage failures on saving flow/task state in the storage.Previously on StorageFailure exception may cause an endless loop duringexecution of flows throwing errors and retrying to save details.

SSL support for zookeeper backend (kazoo client). Now the following optionscan be passed to zookeeper config:keyfile,keyfile_password,certfile,use_ssl,verify_certs.

Python 2.7 support has been dropped. The minimum version of Python nowsupported by taskflow is Python 3.6.