Update config.yml

Author: marc0der

.github/ISSUE_TEMPLATE/config.yml

@@ -3,9 +3,9 @@ contact_links:
   - name: SDKMAN! usage documentation
     url: https://sdkman.io/usage
     about: Find documentation about the available commands here.
-  - name: SDKMAN! Slack community
-    url: https://slack.sdkman.io/
-    about: Please ask and answer questions about usage of SDKMAN! here.
+  - name: SDKMAN! Discord server
+    url: https://discord.gg/y9mVJYVyu4
+    about: Please ask and answer questions about the usage of SDKMAN! here.
   - name: SDKMAN! on Stack Overflow
     url: https://stackoverflow.com/questions/tagged/sdkman
     about: You might find help to common issues here.