Update feature_request.md

Revert "FEATURE: " title. This should be done with labels.

Author: champnic

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,7 +1,7 @@
 ---
 name: Feature request
 about: Suggest an idea for this project
-title: 'FEATURE: '
+title: ''
 labels: ''
 assignees: ''