message: Prepare to release 3.1.0
diff: @@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
  <!-- Add new, unreleased changes here. -->
  +## [3.1.0] - 2017-05-15
  +* Add browserCapabilities and basePath options.
  +
  ## [3.0.0] - 2017-05-09
  * Add build preset support.
  * Remove Node v4 support: Node v4 is no longer in Active LTS, so as per the [Polymer Tools Node.js Support Policy](https://www.polymer-project.org/2.0/docs/tools/node-support) we will not support Node v4 going forward. Please update to Node v6 or later to continue using the latest verisons of Polymer tooling.
  