[skip ci] fix formatting in CHANGELOG

Author: asomers

CHANGELOG.md

@@ -41,7 +41,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - Minimum supported Rust version is now 1.41.0.
   ([#1440](https://github.com/nix-rust/nix/pull/1440))
 - Errno aliases are now associated consts on `Errno`, instead of consts in the
-  `errno` module.`
+  `errno` module.
   (#[1452](https://github.com/nix-rust/nix/pull/1452))
 
 ### Fixed