Start to maintain a change log

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+- Add more examples
+- Add position as out variable from vertex shader
+- Add experimental joystick support
+- Add mouse cursor operations
+- Add `Vec.Floor(…)` function
+- Add circle geometry
+- Fix `Matrix.Unproject(…)` for rotated matrix
+- Add 2D Line geometry
+- Add floating point round error correction
+- Performance improvements
+- Fix race condition in `NewGLTriangles(…)`
+- Add `TriangleData` benchmarks and improvements
+- Add zero rectangle variable for utility and consistency
+- Add support for Go Modules
+- Add `NoIconify` and `AlwaysOnTop` window hints
+
+## [v0.8.0] - 2018-10-10
+Changelog for this and older versions can be found on the corresponding [GitHub
+releases](https://github.com/faiface/pixel/releases).
+
+[Unreleased]: https://github.com/faiface/pixel/compare/v0.8.0...HEAD
+[v0.8.0]: https://github.com/faiface/pixel/releases/tag/v0.8.0

README.md

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 See [requirements](#requirements) for the list of libraries necessary for compilation.
 
+All significant (e.g. breaking) changes are documented in the [CHANGELOG.md](CHANGELOG.md).
+
 ## Tutorial
 
 The [Wiki of this repo](https://github.com/faiface/pixel/wiki) contains an extensive tutorial