Add a changelog

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [0.2.3] - 2015-12-26
+### Changed
+- Upgrade to libc 0.2.4 in hopes of fixing downstream build incompatibilities.
+
+## [0.2.2] - 2015-12-23
+### Changed
+- Change the build to specify the likely path to ImageMagick, for easier setup.
+
+## [0.2.1] - 2015-09-07
+### Changed
+- Fix the cargo package name (replace dash with underscore).
+
+## [0.2.0] - 2015-06-10
+### Changed
+- Add a `fit()` function for fitting an image to a given bounds.
+
+## [0.1.0] - 2015-06-09
+### Changed
+- Initial release