updated feature request template

.github/ISSUE_TEMPLATE/feature_request.md

@@ -10,8 +10,8 @@ A clear and concise description of what the problem is. Ex. I'm always frustrate
 **Describe the solution you'd like**
 A clear and concise description of what you want to happen.
 
-**Describe alternatives you've considered**
+**Describe alternatives you've considered (optional)**
 A clear and concise description of any alternative solutions or features you've considered.
 
-**Additional context**
+**Additional context (optional)**
 Add any other context or screenshots about the feature request here.