Updated issue template [skip ci]

Author: samdark

.github/ISSUE_TEMPLATE.md

@@ -1,3 +1,8 @@
+<!--
+Please use this issue tracker for bugs and feature requests only. In case you need support please use one of
+Yii communities listed at https://github.com/yiisoft/yii2/wiki/communities
+-->
+
 ### What steps will reproduce the problem?
 
 ### What's expected?