Update changelog.md

Author: intoeetive

docs/installation/changelog.md

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 # ExpressionEngine v6 Change Log
 
+## Version 6.4.15
+(Release: October 18, 2023)
+
+- **Contributors** 🙌
+<div class="max-w-7xl mx-autotext-center">
+<div class="space-y-8 sm:space-y-12">
+    <ul role="list" class="mx-auto grid grid-cols-2 gap-x-4 gap-y-1 sm:grid-cols-4 md:gap-x-6 lg:max-w-5xl lg:gap-x-8 lg:gap-y-1 xl:grid-cols-5">
+<li><div class="space-y-4 text-center"><img class="mx-auto h-20 w-20 rounded-full lg:w-24 lg:h-24" src="https://avatars.githubusercontent.com/u/11818941?v=4" /><div class="space-y-2"><div class="text-xs font-medium lg:text-sm"><p class="mb-1">Matt Johnson</p><p class="text-indigo-600"><a href="https://github.com/ExpressionEngine/ExpressionEngine/commits?author=matthewjohns0n" target="_BLANK">@matthewjohns0n</a></p></div></div></div></li>
+<li><div class="space-y-4 text-center"><img class="mx-auto h-20 w-20 rounded-full lg:w-24 lg:h-24" src="https://avatars.githubusercontent.com/u/752126?v=4" /><div class="space-y-2"><div class="text-xs font-medium lg:text-sm"><p class="mb-1">Yuri Salimovskiy</p><p class="text-indigo-600"><a href="https://github.com/ExpressionEngine/ExpressionEngine/commits?author=intoeetive" target="_BLANK">@intoeetive</a></p></div></div></div></li>
+<li><div class="space-y-4 text-center"><img class="mx-auto h-20 w-20 rounded-full lg:w-24 lg:h-24" src="https://avatars.githubusercontent.com/u/563996?v=4" /><div class="space-y-2"><div class="text-xs font-medium lg:text-sm"><p class="mb-1">Bryan Nielsen</p><p class="text-indigo-600"><a href="https://github.com/ExpressionEngine/ExpressionEngine/commits?author=bryannielsen" target="_BLANK">@bryannielsen</a></p></div></div></div></li>
+    </ul>
+</div>
+</div>
+
+**Enhancements 🚀**
+
+- Made ExpressionEngine 6 compatible with PHP 8.2
+- Added `primary_role_id` parameter for `exp:channel:entries` to work same as older `group_id`; [#1353](https://github.com/ExpressionEngine/ExpressionEngine/issues/1353)
+
+**Bug Fixes** 💃🐛
+
+- Resolved [#3759](https://github.com/ExpressionEngine/ExpressionEngine/issues/3759) when pressing Ctrl+S with Redactor editor being in full screen mode would cause the field content to be erased
+- Resolved [#3762](https://github.com/ExpressionEngine/ExpressionEngine/issues/3762) where selection of checkboxes in Grid with values containing single quotes was not re-populated after saving an entry
+
 ## Version 6.4.14
 (Release: August 15, 2023)