fix: use correct discord link in readme (#61)

* Update README.md

* Update README.md

Author: zoey-kaiser

README.md

@@ -7,7 +7,7 @@
 [![GitHub stars](https://badgen.net/github/stars/sidebase/nuxt-session)](https://GitHub.com/sidebase/nuxt-session/)
 [![License][license-src]][license-href]
 [![Follow us on Twitter](https://badgen.net/badge/icon/twitter?icon=twitter&label)](https://twitter.com/sidebase_io)
-[![Join our Discord](https://badgen.net/badge/icon/discord?icon=discord&label)](https://discord.gg/9MUHR8WT9B)
+[![Join our Discord](https://badgen.net/badge/icon/discord?icon=discord&label)](https://discord.gg/NDDgQkcv3s)
 
 > Nuxt session middleware to get a persistent session per app user, e.g., to store data across multiple requests. The nuxt session module provides the `useSession()` composable out of the box and sets up API endpoints to interact with your session to make working with sessions feel like a breeze.