Add changelog

Author: MabezDev

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/).
+
+## [Unreleased]
+
+## v0.2.0 - 2020-09-23
+
+### Changed
+  - Replace `xtenxa-lx6` with `xtensa-lx`, a silicon agnostic craate for the runtime and peripheral access of xtensa CPU's.
+
+### Fixed
+  - Update alloc to support the new `alloc_ref` nightly changes.
+  - Clean up examples
+
+## v0.1.0 - 2020-09-15
+
+- Initial release
+
+[Unreleased]: https://github.com/esp-rs/esp32-hal/compare/v0.2.0...HEAD
+[v0.2.0]: https://github.com/esp-rs/esp32-hal/compare/v0.1.0...v0.2.0
+[v0.1.0]: https://github.com/esp-rs/esp32-hal/tree/v0.1.0