docs: fix discord link

Author: bburda

README.md

@@ -3,7 +3,7 @@
 [![CI](https://github.com/selfpatch/selfpatch_demos/actions/workflows/ci.yml/badge.svg)](https://github.com/selfpatch/selfpatch_demos/actions/workflows/ci.yml)
 [![Docs](https://img.shields.io/badge/docs-GitHub%20Pages-blue)](https://selfpatch.github.io/ros2_medkit/)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
-[![Discord](https://img.shields.io/badge/Discord-Join%20Us-7289DA?logo=discord&logoColor=white)](https://discord.gg/fEbWKTah)
+[![Discord](https://img.shields.io/badge/Discord-Join%20Us-7289DA?logo=discord&logoColor=white)](https://discord.gg/6CXPMApAyq)
 
 Demonstration projects showcasing [ros2_medkit](https://github.com/selfpatch/ros2_medkit) integration
 with real ROS 2 systems.