Update CHANGELOG.md

Author: Fomys

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Passing the `Clock` parameter to `Serial` by reference.
 - `Serial::usart1/2/3` -> `Serial::new`.
 - `Serial` implements `Write<WORD>` and `Read<WORD>` for `WORD` simultaneously as u8 and u16.
+- Bump bxcan version to [v0.7.0](https://github.com/stm32-rs/bxcan/releases/tag/v0.7.0)
 
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