message: Updated CHANGELOG to describe bug fix.
diff: @@ -5,7 +5,9 @@ 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
  +- 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
  