Update feature_request.md

Author: willmcgugan

.github/ISSUE_TEMPLATE/feature_request.md

@@ -9,7 +9,7 @@ assignees: ''
 
 NOTE: If a feature could be implemented in a third-party library, then it is unlikely to be accepted as part of the core library.
 
-Consider posting in https://github.com/textualize/rich/discussions for feedback before raising a feature request.
+NOTE: Feature requests will not be considered unless first approved in discussions (https://github.com/textualize/rich/discussions)
 
 Have you checked the issues for a similar suggestions?