message: Updated CHANGELOG.md to describe License comment deduplication fix.
diff: @@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
  - Handle `<base href="...">` values correctly when inlining imports.
  - Apply `<base target="...">` to links and forms in the same document as
  appropriate.
  +- License comments are deduplicated properly now.
  ## 2.0.0-pre.5 - 2017-02-14
  - Handle base tags when resolving the dependency graph of imports.
  