Issues: update icon_request template

.github/ISSUE_TEMPLATE/icon_request.md

@@ -0,0 +1,17 @@
+---
+name: Icon request
+about: Request an icon you'd like to see added
+title: ''
+labels: enhancement
+assignees: rektdeckard
+
+---
+
+**Describe the requested icon**
+Explain the icon you'd like to see, and potential use-cases.
+
+**Screenshots**
+If applicable, add screenshots to help illustrate the icon appearance.
+
+**Additional context**
+Add any other context here.