Fix discord link.

Author: pierre-rouanet

README.md

@@ -175,4 +175,4 @@ This library is licensed under the [Apache License 2.0](./LICENSE).
 ## Support
 
 Rustypot is developed and maintained by [Pollen-Robotics](https://pollen-robotics.com). They developed open-source hardware and tools for robotics.
-Visit https://pollen-robotics.com to learn more or join the [Discord community](https://discord.com/invite/Kg3mZHTKgs) if you have any questions or want to share your projects.
+Visit https://pollen-robotics.com to learn more or join the [Discord community](https://discord.gg/HDrGY9eJHt) if you have any questions or want to share your projects.