Fix compare link in CHANGELOG

Author: Sh3Rm4n

CHANGELOG.md

@@ -123,7 +123,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Support `stm32f303` device
 
-[Unreleased]: https://github.com/stm32-rs/stm32f1xx-hal/compare/v0.4.1...HEAD
+[Unreleased]: https://github.com/stm32-rs/stm32f3xx-hal/compare/v0.4.1...HEAD
 [v0.4.1]: https://github.com/stm32-rs/stm32f3xx-hal/compare/v0.4.0...v0.4.1
 [v0.4.0]: https://github.com/stm32-rs/stm32f3xx-hal/compare/v0.3.0...v0.4.0
 [v0.3.0]: https://github.com/stm32-rs/stm32f3xx-hal/compare/v0.2.3...v0.3.0