Update the pull request template

.github/PULL_REQUEST_TEMPLATE.md

@@ -6,6 +6,7 @@ Provide a brief description of your changes.
 
 ## Issues
 
+<!-- Remove this if your pull request address changes other than existing issues -->
 Closes #IssueNumber
 (Replace "IssueNumber" with the actual issue number you are addressing.)
 
@@ -23,6 +24,12 @@ Closes #IssueNumber
 - Add a new feature
 - Allow to custmize the widgets
 
+## Additional notes
+<!-- Optional -->
+
+## Suggestions
+<!-- Optional -->
+
 ## Checklist
 
 <!-- Mark all that applies with `[x]` -->