Update CHANGELOG.md

Author: dano-klaviyo

CHANGELOG.md

@@ -2,7 +2,7 @@
 ### [Unreleased]
 
 ### [2.3.4]
-- EventModel does not to throw warnings if optional 'properties' parameter is not set
+- Fix - EventModel does not to throw warnings if optional 'properties' parameter is not set
 
 ### [2.3.3]
 - Update - Add ability to track and identify calls to use POST instead of GET
@@ -60,6 +60,7 @@
 - As this changelog was created after 2.0.0, please refer to the README for version 1 https://github.com/klaviyo/php-klaviyo/tree/d388ca998dff55b2a7e420c2c7aa2cd221365d1c
 
 [Unreleased]: https://github.com/klaviyo/php-klaviyo/compare/2.3.3...HEAD
+[2.3.4]: https://github.com/klaviyo/php-klaviyo/compare/2.3.3...2.3.4
 [2.3.3]: https://github.com/klaviyo/php-klaviyo/compare/2.3.2...2.3.3
 [2.3.2]: https://github.com/klaviyo/php-klaviyo/compare/2.3.1...2.3.2
 [2.3.1]: https://github.com/klaviyo/php-klaviyo/compare/2.3.0...2.3.1