Merge pull request nameko#323 from onefinestay/v2.3.1-rc

Release 2.3.1

Merge pull request nameko#315 from onefinestay/v2.3.0-rc

Release 2.3.0

Merge pull request nameko#280 from onefinestay/v2.2.0-rc

v2.2.0 rc

Merge pull request nameko#257 from onefinestay/polling_queue_consumer

refactor the polling queue consumer

Release v2.1.1

Release v2.1.0