[skip ci] update CHANGELOG for PR #1341

Author: asomers

CHANGELOG.md

@@ -5,9 +5,15 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased] - ReleaseDate
 ### Added
+
 - Added `mremap` (#[1306](https://github.com/nix-rust/nix/pull/1306))
+
 ### Changed
 ### Fixed
+
+- Fixed bugs in `recvmmsg`.
+  (#[1341](https://github.com/nix-rust/nix/pull/1341))
+
 ### Removed
 
 ## [0.19.0] - 6 October 2020