Add a changelog

Author: Sh3Rm4n

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+
+### Added
+
+- USB Driver for all devices except `stm32f301` and `stm32f334` as they have no
+  USB peripheral. (#24)
+- `StatefulOutputPin` and `ToggleableOutputPin` (#25)
+- Support devices with 2-bit PLLSRC fields
+  - This allow using 72 MHz `sysclk` on the `stm32f303`
+- Analog gpio trait (#33)
+- Add PWM Channels (#34)
+
+### Breaking changes
+
+- Alternate gpio functions are now made only available for devices, which have them.
+  (#21)
+- `stm32f303` is now split into `stm32f303xd` and `stm32f303xe` as they provide
+  different alternate gpio functions. `stm32f303` is still available.
+
+
+## [v0.3.0] - 2019-08-26
+
+### Added
+
+- HSE and USB clock are now suppported (#18)
+
+### Changed
+
+- Bump `stm32f3` version to `0.8.0` (#19)
+
+## [v0.2.3] - 2019-07-07
+
+### Fixed
+
+- Fix timer initialization (#17)
+
+## [v0.2.2] - 2019-07-06
+
+## Fix
+
+- Missing `stm32f303` timers (#16)
+
+## [v0.2.1] - 2019-07-06
+
+### Added
+
+- Fully erased pin (#14)
+
+## [v0.2.0] - 2019-07-02
+
+### Changed
+
+- Bump `stm32f3` version to `0.7.1` (#12)
+- BUmp `embedded-hal` version to `0.2.1` (#11)
+
+### Fixed
+
+- Various peripheral mappings for some devices (#12)
+
+### Breaking changers
+
+- Switch to the `embedded-hal` v2 digital pin trait.
+
+## [v0.1.5] - 2019-06-11
+
+### Added
+
+- Support for GPIO AF14 (#6)
+
+## [v0.1.4] - 2019-05-04
+
+### Fixed
+
+- Fixed I2C address (#4)
+
+## [v0.1.3] - 2019-04-12
+
+### Added
+
+- Implement GPIO InputPin traits (#2)