Add note chatbot not working in current excersize (sveltejs#210)

* Add note chatbot not working in current excersize

* Update content/tutorial/01-svelte/07-lifecycle/03-update/README.md

---------

Co-authored-by: Rich Harris <[email protected]>

Author: rafazafar

content/tutorial/01-svelte/07-lifecycle/03-update/README.md

@@ -2,6 +2,8 @@
 title: beforeUpdate and afterUpdate
 ---
 
+> The Eliza Chatbot in this exercise doesn't currently work. For now, you can use the old tutorial instead: https://svelte.dev/tutorial/update
+
 The `beforeUpdate` function schedules work to happen immediately before the DOM is updated. `afterUpdate` is its counterpart, used for running code once the DOM is in sync with your data.
 
 Together, they're useful for doing things imperatively that are difficult to achieve in a purely state-driven way, like updating the scroll position of an element.