message: Add missing CHANGELOG entry.
diff: @@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
  and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
  ## [Unreleased]
  +- Convert Closure `Object` to TypeScript `object`.
  ## [0.3.0] - 2017-12-12
  - `void` is not nullable.
  