message: Prepare to release alpha.40
diff: @@ -13,14 +13,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
  <!--## Unreleased-->
  +## [2.0.0-alpha.40] - 2017-04-28
  +
  * Added support for new JSDoc tags: @customElement, @polymer, @mixinFunction, @appliesMixin
  ## [2.0.0-alpha.39] - 2017-04-26
  -* Add a Class feature kind for describing all kinds of classes. This is a superclass of the existing elements and mixins.
  -
  -## [2.0.0-alpha.38] - 2017-04-13
  -
  * Add a Class feature kind for describing all kinds of classes. This is a superclass of the existing elements and mixins.
  * Mix mixins into mixins. A PolymerElementMixin now has all of the members it inherits other mixins it mixes.
  * Improved our modeling of inheritance:
  