Fixed changelog entry.

Author: yoav-steinberg

CHANGELOG.md

@@ -7,6 +7,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 - Added Netlink protocol families to the `SockProtocol` enum
 (#[1289](https://github.com/nix-rust/nix/pull/1289))
+- Added `TCP_KEEPCNT` and `TCP_KEEPINTVL` TCP keepalive options.
+  (#[1283](https://github.com/nix-rust/nix/pull/1283))
 ### Changed
 - Expose `SeekData` and `SeekHole` on all Linux targets
 (#[1284](https://github.com/nix-rust/nix/pull/1284))
@@ -17,8 +19,6 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [0.18.0] - 26 July 2020
 ### Added
-- Added `TCP_KEEPCNT` and `TCP_KEEPINTVL` TCP keepalive options.
-  (#[1283](https://github.com/nix-rust/nix/pull/1283))
 - Added `fchown(2)` wrapper.
   (#[1257](https://github.com/nix-rust/nix/pull/1257))
 - Added support on linux systems for `MAP_HUGE_`_`SIZE`_ family of flags.