update to svelte 4

Author: Rich-Harris

documentation/blog/2023-12-14-sveltekit-2.md

@@ -9,7 +9,7 @@ Version 2.0 of [SvelteKit](https://kit.svelte.dev), the official framework for b
 
 If you've been paying close attention to Svelte in recent months, you'll know that we've been [hard at work on Svelte 5](https://svelte-5-preview.vercel.app/docs/introduction), which is possibly the most anticipated release in the project's history. Upgrading to SvelteKit 2 will smooth the path for Svelte 5 when it is released in 2024, and we encourage all users to upgrade when you get a chance.
 
-We recommend updating to the most recent 1.x release first in order to address any deprecation warnings. Then, upgrade to SvelteKit 2 by running the automated migration tool:
+We recommend updating to the most recent 1.x release first, along with Svelte 4, in order to address any deprecation warnings. Then, upgrade to SvelteKit 2 by running the automated migration tool:
 
 ```bash
 npx svelte-migrate sveltekit-2