Add a CHANGELOG

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file, following
+the format defined at [keepachangelog.com](http://keepachangelog.com/).
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+
+### Added
+- This CHANGELOG for keeping track of notable changes.
+- `Matrix4::{from_scale, from_nonuniform_scale}` for easily constructing
+  homogeneous scale matrices.
+
+### Changed
+- Renamed `SquareMatrix::one` to `SquareMatrix::identity`. `identity` is easier
+  to search for,
+  and the more common name for the multiplicative identity for matrices.
+- Matrix impls have now been constrained to `S: BaseFloat`.
+
+## [v0.5.0] - 2015-11-20
+
+### Changed
+- Take many point and vector parameters by value.
+- Take point and vector operator overloads by value.
+- Divide `Matrix` trait into `Matrix` and `SquareMatrix`, opening the door for
+  non-square matrices in the future.
+- Make many trait type parameters associated types.
+- Move element-wise methods from `Vector` and `Point` onto the `Array1` trait,
+  and rename it to `Array`.
+- Make pointer access methods on `Array` match the naming scheme of those in the
+  standard library.
+
+### Removed
+- Removed collision types: `Ray`, `Plane`, `Frustum`, `Aabb2`, `Aabb3` `Obb2`,
+  `Obb3` `Sphere`, `Cylinder`. These can now be found at
+  [csherratt/collision-rs](https://github.com/csherratt/collision-rs).
+- Remove `Array2` trait, moving methods onto the `Matrix` trait.
+
+## [v0.4.0] - 2015-10-25
+
+## [v0.3.1] - 2015-09-20
+
+## [v0.3.0] - 2015-09-20
+
+## [v0.2.0] - 2015-05-11
+
+## [v0.1.6] - 2015-05-10
+
+## [v0.1.5] - 2015-04-25
+
+## [v0.1.4] - 2015-04-24
+
+## [v0.1.3] - 2015-04-06
+
+## [v0.1.2] - 2015-04-01
+
+## [v0.1.1] - 2015-03-25
+
+## [v0.1.0] - 2015-03-15
+
+## [v0.0.8] - 2015-03-09
+
+## [v0.0.7] - 2015-03-01
+
+## [v0.0.6] - 2015-02-21
+
+## [v0.0.5] - 2015-02-16
+
+## [v0.0.4] - 2015-02-11
+
+## [v0.0.3] - 2015-02-08
+
+## v0.0.1 - 2014-06-24
+
+[Unreleased]: https://github.com/bjz/cgmath-rs/compare/v0.5.0...HEAD
+[v0.5.0]: https://github.com/bjz/cgmath-rs/compare/v0.4.0...v0.5.0
+[v0.4.0]: https://github.com/bjz/cgmath-rs/compare/v0.3.1...v0.4.0
+[v0.3.1]: https://github.com/bjz/cgmath-rs/compare/v0.3.0...v0.3.1
+[v0.3.0]: https://github.com/bjz/cgmath-rs/compare/v0.2.0...v0.3.0
+[v0.2.0]: https://github.com/bjz/cgmath-rs/compare/v0.1.6...v0.2.0
+[v0.1.6]: https://github.com/bjz/cgmath-rs/compare/v0.1.5...v0.1.6
+[v0.1.5]: https://github.com/bjz/cgmath-rs/compare/v0.1.4...v0.1.5
+[v0.1.4]: https://github.com/bjz/cgmath-rs/compare/v0.1.3...v0.1.4
+[v0.1.3]: https://github.com/bjz/cgmath-rs/compare/v0.1.2...v0.1.3
+[v0.1.2]: https://github.com/bjz/cgmath-rs/compare/v0.1.1...v0.1.2
+[v0.1.1]: https://github.com/bjz/cgmath-rs/compare/v0.1.0...v0.1.1
+[v0.1.0]: https://github.com/bjz/cgmath-rs/compare/v0.0.8...v0.1.0
+[v0.0.8]: https://github.com/bjz/cgmath-rs/compare/v0.0.7...v0.0.8
+[v0.0.7]: https://github.com/bjz/cgmath-rs/compare/v0.0.6...v0.0.7
+[v0.0.6]: https://github.com/bjz/cgmath-rs/compare/v0.0.5...v0.0.6
+[v0.0.5]: https://github.com/bjz/cgmath-rs/compare/v0.0.4...v0.0.5
+[v0.0.4]: https://github.com/bjz/cgmath-rs/compare/v0.0.3...v0.0.4
+[v0.0.3]: https://github.com/bjz/cgmath-rs/compare/v0.0.1...v0.0.3