Update issue_template.md

Author: vongosling

.github/ISSUE_TEMPLATE/issue_template.md

@@ -4,7 +4,7 @@ about: Describe this issue template's purpose here.
 
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-The issue tracker is **ONLY** used for bug report and feature request. Keep in mind, please check whether there is an existing same report before your raise a new one.
+The issue tracker is **ONLY** used for bug report(feature request need to follow [RIP process](https://github.com/apache/rocketmq/wiki/RocketMQ-Improvement-Proposal)). Keep in mind, please check whether there is an existing same report before your raise a new one.
 
 Alternately (especially if your communication is not a bug report), you can send mail to our [mailing lists](http://rocketmq.apache.org/about/contact/). We welcome any friendly suggestions, bug fixes, collaboration and other improvements.