message: CHANGELOG: fix tag
diff: ## [1.0.0] - 2019-10-21
  [Unreleased]: https://github.com/airbrake/airbrake-js/compare/v2.0.0...master
  -[1.4.2]: https://github.com/airbrake/airbrake-js/releases/tag/v2.0.0
  +[2.0.0]: https://github.com/airbrake/airbrake-js/releases/tag/v2.0.0
  [1.4.2]: https://github.com/airbrake/airbrake-js/releases/tag/v1.4.2
  [1.4.1]: https://github.com/airbrake/airbrake-js/releases/tag/v1.4.1
  [1.4.0]: https://github.com/airbrake/airbrake-js/releases/tag/v1.4.0
  