Add changelog

Author: eldruin

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](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+<!-- next-header -->
+## [Unreleased] - ReleaseDate
+
+### Added
+- Add ability to read capture file descriptor #18
+- Add functions for polarity get/set #16
+- Add `get_duty_cycle` and `set_duty_cycle` methods #13
+- Add getter for checking state of `enable`
+
+### Fixed
+- Fix addition of explicit `dyn`
+- Handle errors in closure for function `with_exported` #14
+
+### Removed
+- Remove implementation of deprecated `Error::description` function
+
+## [0.1.0] - 2016-03-02
+
+- Initial release.
+
+<!-- next-url -->
+[Unreleased]: https://github.com/rust-embedded/rust-sysfs-pwm/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/rust-embedded/rust-sysfs-pwm/releases/tag/v0.1.0