[CLEANUP] Add missing PR number to changelog (MyIntervals#626)

(MyIntervals#413)

Co-authored-by: Jake Hotson <jake.github@qzdesign.co.uk>

Author: JakeQZ

CHANGELOG.md

@@ -14,7 +14,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Changed
 
-- Improve performance of Value::parseValue with many delimiters by refactoring to remove array_search()
+- Improve performance of Value::parseValue with many delimiters by refactoring to remove array_search() (#413)
 - Add visibility to all class/interface constants (#469)
 
 ### Deprecated