Replace slack channel link with discord server link

[chamil321]

Purpose

$Subject

Related to ballerina-platform/ballerina-library#3463

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec

[codecov]

Codecov Report

Base: 81.81% // Head: 81.81% // No change to project coverage 👍

Coverage data is based on head (40e1b89) compared to base (9b5f0a9).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #452   +/-   ##
=========================================
  Coverage     81.81%   81.81%           
  Complexity       10       10           
=========================================
  Files             7        7           
  Lines            33       33           
  Branches         10       10           
=========================================
  Hits             27       27           
  Misses            4        4           
  Partials          2        2           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.