Update CHANGELOG.md

Author: tanhauhau

CHANGELOG.md

@@ -9,6 +9,7 @@
 * Fix value of `let:` bindings not updating in certain cases ([#7440](https://github.com/sveltejs/svelte/issues/7440))
 * Strip leading newline after `<pre>` and `<textarea>` ([#7264](https://github.com/sveltejs/svelte/issues/7264))
 * Fix local transition for `{#key}` block ([#5950](https://github.com/sveltejs/svelte/issues/5950))
+* Fix errorneous setting `textContent` for `<template>` element ([#7297](https://github.com/sveltejs/svelte/pull/7297))
 
 ## 3.47.0