message: Updated CHANGELOG for 1.2.4 release.
diff: @@ -5,11 +5,13 @@ All notable changes to this project will be documented in this file.
  The format is based on [Keep a Changelog](http://keepachangelog.com/)
  and this project adheres to [Semantic Versioning](http://semver.org/).
  -## Unreleased
  +<!-- ## Unreleased -->
  +<!-- Add new, unreleased changes here. -->
  +
  +## [1.2.4] - 2017-05-11
  * Simplify addCustomElementsEs5Adapter() adapter injection method.
  * Bundler stream no longer emits any CSS or Javascript files which have been inlined into bundles.
  -<!-- Add new, unreleased changes here. -->
  ## [1.2.3] - 2017-05-10
  