Update issue_template.md

.github/issue_template.md

@@ -14,6 +14,10 @@ or anything that violates the specifications.
 
 <!--- Provide a general summary of the issue in the title above -->
 
+<!--- 
+  If you aren't sure what Swagger-UI version, see this guide: https://github.com/swagger-api/swagger-ui/blob/master/docs/version-detection.md
+--->
+
 
 | Q                               | A
 | ------------------------------- | -------