bump e-h version in changelog

Author: almindor

CHANGELOG.md

@@ -12,7 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Fix `asm::delay()` to ensure count register is always reloaded
 ### Changed
 
- - Use new `DelayUs` trait from `embedded-hal` `v1.0.0-alpha.7`
+ - Use new `DelayUs` trait from `embedded-hal` `v1.0.0-alpha.8`
    - NOTE: this removes `DelayMs` and `DelayUs` with `u64` version
 
 ## [v0.8.0] - 2022-04-20