Update README.md

Author: 3djc

README.md

@@ -1,7 +1,7 @@
 ## OpenTX 2.3 Branch
 
 [![Travis build Status](https://travis-ci.org/opentx/opentx.svg?branch=2.3)](https://travis-ci.org/opentx/opentx)
-[![Join the Discord chat](https://img.shields.io/badge/discord-join_chat-yellow.svg)](https://discord.gg/pAmmCp2)
+[![Join the Discord chat](https://img.shields.io/badge/discord-join_chat-yellow.svg)](https://discord.gg/CZCwVx2)
 [![Donate using Paypal](https://img.shields.io/badge/paypal-donate-yellow.svg)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=DJ9MASSKVW8WN)
 
 The ongoing development on 2.3.x is done in this branch.