update changelog

Author: Conduitry

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 * Fix dynamic `autofocus={...}` attribute handling ([#4995](https://github.com/sveltejs/svelte/issues/4995))
 * Add filename to combined source map if needed ([#6089](https://github.com/sveltejs/svelte/pull/6089))
+* In AST, parse empty attribute values as an empty string ([#6286](https://github.com/sveltejs/svelte/issues/6286))
 * Fix tracking whether transition has started ([#6399](https://github.com/sveltejs/svelte/pull/6399))
 * Fix incorrect scoping of `:global()` selectors ([#6550](https://github.com/sveltejs/svelte/issues/6550))