Add changelog

CHANGELOG.md

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+# Change Log
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/) and adheres to [Semantic Versioning](http://semver.org) as of version 1.0.0.
+
+## [Unreleased]
+### Added
+### Changed
+### Deprecated
+### Removed
+### Fixed
+### Security
+
+## [1.0.0] - 2017-02-13
+Due to the lack of changelog and infrequent versioning up until version 1.0.0, no changelog is provided for older versions. Versions after 1.0.0 will have a changelog.
+
+### Added
+- Project now adheres to semantic versioning.
+
+## [0.2.0] - 2015-08-31
+- No changelog was kept
+
+## [0.1.2] - 2015-06-19
+- No changelog was kept
+
+## [0.1.1] - 2015-06-19
+- No changelog was kept
+
+## 0.1.0 - 2015-06-19
+- Initial release
+
+[Unreleased]: https://github.com/travis-ci/jupiter-brain/compare/v1.0.0...master
+[1.0.0]: https://github.com/travis-ci/jupiter-brain/compare/v0.2.0...v1.0.0
+[0.2.0]: https://github.com/travis-ci/jupiter-brain/compare/v0.1.2...v0.2.0
+[0.1.2]: https://github.com/travis-ci/jupiter-brain/compare/v0.1.1...v0.1.2
+[0.1.1]: https://github.com/travis-ci/jupiter-brain/compare/v0.1.0...v0.1.1