message: Set version in CHANGELOG.
diff: @@ -5,7 +5,7 @@ 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
  +## 1.15.3 - 2017-01-17
  - Fix for how paths are rewritten in nested import scenarios where paths to same
  directory were ignored instead of treated as "." for relative path.
  