Clarify feature request template.

Author: marc0der

.github/ISSUE_TEMPLATE/feature_request.md

@@ -6,9 +6,10 @@ labels: 'enhancement'
 assignees: ''
 ---
 
-<!-- Thank you for suggesting a new feature. Please consider discussing your idea in our Slack channel before requesting a new feature. -->
+<!-- Thank you for suggesting a new feature. Please discuss your idea on our #cli-development Slack channel before requesting a new feature. -->
 
 - [ ] I have read the [CONTRIBUTING guidelines](CONTRIBUTING.md)
+- [ ] I've had a conversation on the [#cli-development](https://sdkman.slack.com/app_redirect?channel=cli-development) Slack channel about this request.
 
 **Feature request**
 <!-- A clear and precise description of what new or changed feature you want. Please include the reason, why you would need the feature. E.g. what problem does it solve? Or which workflow is currently frustrating and will be improved by this? -->