Update README.md

Author: tannerlinsley

README.md

@@ -6,6 +6,8 @@ Hooks for fetching, caching and updating asynchronous data in React
 
 <a href="https://twitter.com/intent/tweet?button_hashtag=TanStack" target="\_parent">
   <img alt="#TanStack" src="https://img.shields.io/twitter/url?color=%2308a0e9&label=%23TanStack&style=social&url=https%3A%2F%2Ftwitter.com%2Fintent%2Ftweet%3Fbutton_hashtag%3DTanStack">
+</a><a href="https://discord.com/invite/WrRKjPJ" target="\_parent">
+  <img alt="" src="https://img.shields.io/badge/Discord-TanStack-%235865F2" />
 </a><a href="https://github.com/tannerlinsley/react-query/actions?query=workflow%3A%22react-query+tests%22">
 <img src="https://github.com/tannerlinsley/react-query/workflows/react-query%20tests/badge.svg" />
 </a><a href="https://npmjs.com/package/react-query" target="\_parent">