Add a Changelog (#44)

Add a Changelog

Author: dfrankland

CHANGELOG.md

@@ -0,0 +1,105 @@
+# 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](https://github.com/stm32-rs/stm32f3xx-hal/pull/24))
+- `StatefulOutputPin` and `ToggleableOutputPin` ([#25](https://github.com/stm32-rs/stm32f3xx-hal/pull/25))
+- Support devices with 2-bit PLLSRC fields
+  - This allow using 72 MHz `sysclk` on the `stm32f303`
+- Analog gpio trait ([#33](https://github.com/stm32-rs/stm32f3xx-hal/pull/33))
+- Add PWM Channels ([#34](https://github.com/stm32-rs/stm32f3xx-hal/pull/34))
+
+### Breaking changes
+
+- Alternate gpio functions are now made only available for devices, which have them.
+  ([#21](https://github.com/stm32-rs/stm32f3xx-hal/pull/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](https://github.com/stm32-rs/stm32f3xx-hal/pull/18))
+
+### Changed
+
+- Bump `stm32f3` version to `0.8.0` ([#19](https://github.com/stm32-rs/stm32f3xx-hal/pull/19))
+
+## [v0.2.3] - 2019-07-07
+
+### Fixed
+
+- Fix timer initialization ([#17](https://github.com/stm32-rs/stm32f3xx-hal/pull/17))
+
+## [v0.2.2] - 2019-07-06
+
+## Fix
+
+- Missing `stm32f303` timers ([#16](https://github.com/stm32-rs/stm32f3xx-hal/pull/16))
+
+## [v0.2.1] - 2019-07-06
+
+### Added
+
+- Fully erased pin ([#14](https://github.com/stm32-rs/stm32f3xx-hal/pull/14))
+
+## [v0.2.0] - 2019-07-02
+
+### Changed
+
+- Bump `stm32f3` version to `0.7.1` ([#12](https://github.com/stm32-rs/stm32f3xx-hal/pull/12))
+- BUmp `embedded-hal` version to `0.2.1` ([#11](https://github.com/stm32-rs/stm32f3xx-hal/pull/11))
+
+### Fixed
+
+- Various peripheral mappings for some devices ([#12](https://github.com/stm32-rs/stm32f3xx-hal/pull/12))
+
+### Breaking changers
+
+- Switch to the `embedded-hal` v2 digital pin trait.
+
+## [v0.1.5] - 2019-06-11
+
+### Added
+
+- Support for GPIO AF14 ([#6](https://github.com/stm32-rs/stm32f3xx-hal/pull/6))
+
+## [v0.1.4] - 2019-05-04
+
+### Fixed
+
+- Fixed I2C address ([#4](https://github.com/stm32-rs/stm32f3xx-hal/pull/4))
+
+## [v0.1.3] - 2019-04-12
+
+### Added
+
+- Implement GPIO InputPin traits ([#2](https://github.com/stm32-rs/stm32f3xx-hal/pull/2))
+
+## [v0.1.2] - 2019-04-06
+
+### Added 
+
+- Support `stm32f328`, `stm32f358` and `stm32f398` devices
+- Support `stm32f334` device
+- Support `stm32f378` device
+- Support `stm32f373` device
+
+## [v0.1.1] - 2019-03-31
+
+- Support `stm32f301` and `stm32f318` devices
+- Support `stm32f302` device
+
+## [v0.1.0] - 2019-03-31
+
+- Support `stm32f303` device