update changelog

Author: dummdidumm

CHANGELOG.md

@@ -6,6 +6,7 @@
 * Fix erroneous `unknown prop` warning when using slot on a component ([#6065](https://github.com/sveltejs/svelte/pull/6065))
 * Throw compiler error when passing empty directive names ([#6299](https://github.com/sveltejs/svelte/issues/6299))
 * New a11y warning `a11y-mouse-events-have-key-events` which checks that `mouseover`/`mouseout` are accompanied by `focus`/`blur` event handlers ([5938](https://github.com/sveltejs/svelte/pull/5938))
+* Fix `preserveComments` in SSR mode ([4730](https://github.com/sveltejs/svelte/issues/4730))
 
 ## 3.38.3