docs: Update CHANGELOG for 4.6.0 release

Author: florianeckerstorfer

README.md

@@ -521,6 +521,12 @@ $slugify = $container->get(Slugify\SlugifyInterface::class);
 
 ## Change Log
 
+### Version 4.6.0 (10 September 2024)
+
+-   [#336](https://github.com/cocur/slugify/pull/336) Add Yiddish language ruleset ([yankl](https://github.com/yankl))
+-   [#340](https://github.com/cocur/slugify/pull/340) Fix for Symfony 7.1 (by [Evgeny1973](https://github.com/Evgeny1973))
+-   [#342](https://github.com/cocur/slugify/pull/342) Fix PHP 8.4 deprecation about implicit null arguments (by [shyim](https://github.com/shyim))
+
 ### Version 4.5.1 (16 September 2023)
 
 -   Drop support for PHP 7 and fix version constraints