Update CHANGELOG.md

Co-authored-by: Alan Somers <[email protected]>

Author: vkkoskie

CHANGELOG.md

@@ -8,7 +8,6 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 - Documentation of the `sys::wait` module
   (#[1732](https://github.com/nix-rust/nix/pull/1732))
-
 - Added `aio_writev` and `aio_readv`.
   (#[1713](https://github.com/nix-rust/nix/pull/1713))
 - Added `Pid::as_wait_pgrp` for use with `waitpid`