Update issue_template.md

.github/issue_template.md

@@ -12,5 +12,5 @@ When reporting a visual problem on a map please provide:
 - Clear description of the problem: What object is missing/extra/wrong? What did you expect to be in the map instead?
 - URL / link to the specific location in a live map demo where the bug is visible
 - Zoom level(s) at which the bug appears
-- Screenshot of the problem are cool! Drag&drop an image to the report here...
+- Screenshot of the problem is very beneficial! It's permanent and browser-independent. Drag&drop an image to the report.
 - Check our GL styles (https://openmaptiles.org/styles/) and list the affected one (OSM Bright, Basic, Terrain, Positron, etc).