Update feature_request.md

Author: hieuwu

.github/ISSUE_TEMPLATE/feature_request.md

@@ -6,14 +6,14 @@ labels: ''
 assignees: ''
 ---
 
-**Is your feature request related to a problem? Please describe.**
+## :bulb: Is your feature request related to a problem? Please describe.
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
 
-**Describe the solution you'd like**
+## :white_check_mark: Describe the solution you'd like
 A clear and concise description of what you want to happen.
 
-**Describe alternatives you've considered**
+## :part_alternation_mark: Describe alternatives you've considered**
 A clear and concise description of any alternative solutions or features you've considered.
 
-**Additional context**
+## :construction: Additional context
 Add any other context or screenshots about the feature request here.