[skip ci] Add v0.19.1 release notes to CHANGELOG

Author: asomers

CHANGELOG.md

@@ -5,17 +5,17 @@ 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
+### Changed
+### Removed
 
+## [0.19.1] - 28 November 2020
+### Fixed
 - Fixed bugs in `recvmmsg`.
   (#[1341](https://github.com/nix-rust/nix/pull/1341))
 
-### Removed
-
 ## [0.19.0] - 6 October 2020
 ### Added
 - Added Netlink protocol families to the `SockProtocol` enum