message: Prepare release of 0.22.1 with CHANGELOG update.
diff: @@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
  ## Unreleased
  +## [0.22.1](https://github.com/PolymerLabs/polyserve/tree/v0.22.1) (2017-09-19)
  +
  * Fixes issue with the babel compile cache where different compilation options were using the same namespace. ([#216](https://github.com/Polymer/polyserve/issues/216)).
  ## [0.22.0](https://github.com/PolymerLabs/polyserve/tree/v0.22.0) (2017-09-18)
  