message: added Unreleased item
diff: @@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
  and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
  ## [Unreleased]
  +### Coming In [3.0]: `save()` will return a Promise
  +
  ## [2.5.0] - 2018-12-??
  ### Added
  