Update CHANGELOG.md

Fix formatting of changelog so publish action works.

Author: beakerandjake

CHANGELOG.md

@@ -6,7 +6,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
 - Fix command text in template README file ([#221](https://github.com/beakerandjake/advent-of-code-runner/pull/221))
+### Security
 - Dependabot bump word-wrap package from 1.2.3 to 1.2.4 ([#220](https://github.com/beakerandjake/advent-of-code-runner/pull/220))
 
 ## [1.3.5] - 2023-03-30