Add CHANGELOG.md

.npmignore

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 webpack.config.js
 jest.config.js
 tsconfig.json
+CHANGELOG.md
 .travis.yml
 src/

CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0).
+
+This project adheres to [Semantic Versioning](https://semver.org).
+
+## [Unreleased]
+
+## [2.0.0] - 2019-07-13
+
+### Added
+
+- Tests and Travis CI support
+- CHANGELOG
+
+### Changed
+
+- Use React hooks instead of classes
+- Build library in production mode to decrease size
+
+## [1.0.0] - 2019-03-20
+
+### Added
+
+- Everything
+
+[unreleased]: https://github.com/Xyfir/react-github-gist/compare/2.0.0...HEAD
+[2.0.0]: https://github.com/Xyfir/react-github-gist/releases/tag/2.0.0
+[1.0.0]: https://github.com/Xyfir/react-github-gist/releases/tag/1.0.0