fix discord invite link

README.md

@@ -23,7 +23,7 @@ channel below.
 > If you need support with KMK or just want to say hi, find us in
 > [#kmkfw:klar.sh on Matrix](https://matrix.to/#/#kmkfw:klar.sh).  This channel
 > is bridged to Discord
-> [here](https://discordapp.com/widget?id=493256121075761173&theme=dark) for
+> [here](https://discord.gg/QBHUUpeGUd) for
 > convenience.
 
 ## Features