Adds CHANGELOG entry for #24

Author: michalbundyra

CHANGELOG.md

@@ -6,7 +6,7 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Added
 
-- Nothing.
+- [#24](https://github.com/zendframework/zend-mvc-plugin-flashmessenger/pull/24) adds support for PHP 7.3.
 
 ### Changed
 
@@ -18,7 +18,7 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Removed
 
-- Nothing.
+- [#24](https://github.com/zendframework/zend-mvc-plugin-flashmessenger/pull/24) removes support for zend-stdlib v2 releases.
 
 ### Fixed