turn on validation for feature requests

Author: jhuleatt

.github/ISSUE_TEMPLATE/fr.md

@@ -4,7 +4,7 @@ about: Have a feature you'd like to see in an extension? Request it here.
 ---
 
 <!-- DO NOT DELETE
-validate_template=false
+validate_template=true
 template_path=.github/ISSUE_TEMPLATE/fr.md
 -->
 
@@ -17,10 +17,10 @@ Issues filed here should be about bugs for a **specific extension in this reposi
 
 This feature request is for extension: **\_** (`storage-resize-images`, `firestore-send-email`, etc)
 
-## What feature would you like to see?
+### What feature would you like to see?
 
 Describe the feature you would like to add, or how you'd like to see the extension change.
 
-## How would you use it?
+### How would you use it?
 
 Tell us how you'd use this feature in your app.