Add a change log

CHANGELOG.md

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+# Change Log
+This project attempts to adhere to [Semantic Versioning](http://semver.org).
+
+## [0.5.1] - (2016-08-23)
+### Added
+- Add Cargo generated documentation
+
+### Fixed
+- Fix panic when Jaro or Jaro-Winkler are given strings both with a length of
+one
+
+## [0.5.0] - (2016-08-11)
+### Changed
+- Make Hamming faster (thanks @IBUzPE9) when the two strings have the same
+length but slower when they have different lengths
+
+## [0.4.1] - (2016-04-18)
+### Added
+- Add Vagrant setup for development
+- Add AppVeyor configuration for Windows CI
+
+### Fixed
+- Fix metrics when given strings with multibyte characters (thanks @WanzenBug)
+
+## [0.4.0] - (2015-06-10)
+### Added
+- For each metric, add a function that takes a vector of strings and returns a
+vector of results (thanks @ovarene)
+
+## [0.3.0] - (2015-04-30)
+### Changed
+- Remove usage of unstable Rust features
+
+## [0.2.5] - (2015-04-24)
+### Fixed
+- Remove unnecessary `Float` import from doc tests
+
+## [0.2.4] - (2015-04-15)
+### Fixed
+- Remove unused `core` feature flag
+
+## [0.2.3] - (2015-04-01)
+### Fixed
+- Remove now unnecessary `Float` import
+
+## [0.2.2] - (2015-03-29)
+### Fixed
+- Remove usage of `char_at` (marked as unstable)
+
+## [0.2.1] - (2015-02-20)
+### Fixed
+- Update bit vector import to match Rust update
+
+## [0.2.0] - (2015-02-19)
+### Added
+- Implement Damerau-Levenshtein
+- Add tests in docs
+
+## [0.1.1] - (2015-02-10)
+### Added
+- Configure Travis for CI
+- Add rustdoc comments
+
+### Fixed
+- Limit Jaro-Winkler return value to a maximum of 1.0
+- Fix float comparsions in tests
+
+## [0.1.0] - (2015-02-09)
+### Added
+- Implement Hamming, Jaro, Jaro-Winkler, and Levenshtein
+
+[Unreleased]: https://github.com/dguo/strsim-rs/compare/0.5.1...HEAD
+[0.5.1]: https://github.com/dguo/strsim-rs/compare/0.5.0...0.5.1
+[0.5.0]: https://github.com/dguo/strsim-rs/compare/0.4.1...0.5.0
+[0.4.1]: https://github.com/dguo/strsim-rs/compare/0.4.0...0.4.1
+[0.4.0]: https://github.com/dguo/strsim-rs/compare/0.3.0...0.4.0
+[0.3.0]: https://github.com/dguo/strsim-rs/compare/0.2.5...0.3.0
+[0.2.5]: https://github.com/dguo/strsim-rs/compare/0.2.4...0.2.5
+[0.2.4]: https://github.com/dguo/strsim-rs/compare/0.2.3...0.2.4
+[0.2.3]: https://github.com/dguo/strsim-rs/compare/0.2.2...0.2.3
+[0.2.2]: https://github.com/dguo/strsim-rs/compare/0.2.1...0.2.2
+[0.2.1]: https://github.com/dguo/strsim-rs/compare/0.2.0...0.2.1
+[0.2.0]: https://github.com/dguo/strsim-rs/compare/0.1.1...0.2.0
+[0.1.1]: https://github.com/dguo/strsim-rs/compare/0.1.0...0.1.1
+[0.1.0]: https://github.com/dguo/strsim-rs/compare/fabad4...0.1.0
+