message: Updated CHANGELOG for bundler 2.0.0 release.
diff: @@ -5,10 +5,12 @@ 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. -->
  +
  +## 2.0.0 - 2017-05-18
  - Fixed a bug with url-rewriting in cases where base urls provided
  has mix of relative and absolute pathnames.
  -<!-- Add new, unreleased changes here. -->
  ## 2.0.0-pre.18 - 2017-05-15
  - Updated dependency on `polymer-analyzer` to ^2.0.0 now that it is
  