Update CHANGELOG.md

Author: KunWuChan

CHANGELOG.md

@@ -6,7 +6,8 @@ document.
 
 ## Unreleased / Beta / In Rust Nightly
 ### New Lints
-- **`relative_path_in_macro_definition`**: Warns about relative paths to `core` or `kernel` in macro definitions, recommending absolute paths to avoid ambiguity.
+- **`relative_path_in_macro_definition`**:
+  Warns about relative paths to `core` or `kernel` in macro definitions, recommending absolute paths to avoid ambiguity.
 
 [3e3715c3...master](https://github.com/rust-lang/rust-clippy/compare/3e3715c3...master)