Update README.md

Author: fedorovvvv

README.md

@@ -11,7 +11,7 @@
 [Floating UI](https://github.com/floating-ui/floating-ui/) for Svelte with [actions](https://svelte.dev/docs#use_action). No wrapper components or component bindings required!
 
 ```bash
-npm i -D svelte-floating-ui
+npm i -D svelte-floating-ui @floating-ui/core
 ```
 
 ## Usage