docs: note about unplugin

Author: antfu

README.md

@@ -2,7 +2,7 @@
 
 [![NPM version](https://img.shields.io/npm/v/unplugin-vue2-script-setup?color=a1b858&label=)](https://www.npmjs.com/package/unplugin-vue2-script-setup)
 
-Bring [`<script setup>`](https://v3.vuejs.org/api/sfc-script-setup.html#sfc-script-setup) to Vue 2.
+Bring [`<script setup>`](https://v3.vuejs.org/api/sfc-script-setup.html#sfc-script-setup) to Vue 2. Works for Vite, Nuxt, Vue CLI, Webpack and more, powered by [unplugin](https://github.com/unjs/unplugin).
 
 ## Install