Update changelog

Author: koute

CHANGELOG.md

@@ -71,6 +71,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - Removed the the `PATH_MAX` restriction from APIs accepting paths. Paths
   will now be allocated on the heap if they are too long. In addition, large
   instruction count improvements (~30x) were made to path handling.
+- `uname` now returns a `Result` instead of blindly assuming the call never fails.
+- Getters on the `UtsName` struct now return a `&[u8]` instead of `&str`.
 
 ### Fixed