message: docs: add unreleased changes to changelog
diff: @@ -4,6 +4,15 @@ All notable changes to this project will be documented in this file.
  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 Changes
  +### Breaking Change
  +
  +### Fixed
  +
  +### Added
  +
  +### Changed
  +
  ## [2.0.0] - 2019-06-02
  ### Breaking Change
  - Dropped support for Node.js 4 and 6
  