also change second discord link in readme

seems this was missing in the previous PR.

Author: softhack007

readme.md

@@ -66,7 +66,7 @@ Credits [here](https://kno.wled.ge/about/contributors/)!
 
 Join the Discord server to discuss everything about WLED!
 
-<a href="https://discord.gg/KuqP7NE"><img src="https://discordapp.com/api/guilds/473448917040758787/widget.png?style=banner2" width="25%"></a>
+<a href="https://discord.gg/A2FpqFQaRS"><img src="https://discordapp.com/api/guilds/473448917040758787/widget.png?style=banner2" width="25%"></a>
 
 Check out the WLED [Discourse forum](https://wled.discourse.group)!