message: Updated CHANGELOG to describe the bundler -> bundler() change in PolymerProject.
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
  <!-- List New Changes Here -->
  +* PolymerProject's `bundler` property is now a `bundler()` method, returning a new BuildBundler stream on each call. This is to support parallel pipelines using bundler.
  +
  ## [0.8.4] - 2017-03-04
  * Build now delegates authority to the Analyzer for what urls are package external instead of local heuristics.
  