Update feature_request.md

Author: kdinev

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest an idea for this project
 title: ''
-labels: 'feature-request'
+labels: ':toolbox: feature-request'
 assignees: ''
 projects: IgniteUI/16