Update index.html

Author: mulle-nat

index.html

@@ -137,7 +137,7 @@ <h2>+[mulle-objc install]</h2>
       <section class="keep-together">
       <h2>+[mulle-objc support]</h2>
 
-      Get support on the <a href="https://discord.gg/3jUQCUgw">mulle-objc Discord</a>.
+      Get support on the <a href="https://discord.gg/5PAnRR28aM">mulle-objc Discord</a>.
       <p>
       Support the project by <a href="https://github.com/mulle-objc/mulle-objc.github.io/issues/1">becoming a public member</a> of <tt>mulle-objc</tt> and 
       to get a nice logo for your github profile: