Update CHANGELOG.md

Author: erikw

CHANGELOG.md

@@ -5,6 +5,7 @@ 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]
+## [1.5.1] - 2025-03-10
 ### Fixed
 - Strip newlines from generated HTML to prevent unnecessary spaces to be added. [#9](https://github.com/erikw/jekyll-glossary_tooltip/issues/9)