Merge pull request #664 from juicycleff/non-expired-discord-link

Change discord link for non expired.

README.md

@@ -9,7 +9,7 @@
 [![Star on GitHub][github-star-badge]][github-star]
 
 [![Gitter](https://badges.gitter.im/flutter-unity/community.svg)](https://gitter.im/flutter-unity/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
-[![Discord](https://img.shields.io/badge/Discord-blue?style=for-the-badge)](https://discord.gg/uUEMzrtZ)
+[![Discord](https://img.shields.io/badge/Discord-blue?style=for-the-badge)](https://discord.gg/KmMqD7Sv3K)
 
 Flutter unity 3D widget for embedding unity in flutter. Now you can make awesome gamified features of your app in Unity and get it rendered in a Flutter app both in fullscreen and embeddable mode. Works great on `Android, iPad OS, iOS, Web, with Windows` nearing completion. There are now two unity app examples in the unity folder, one with the default scene and another based on Unity AR foundation samples.
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