add CHANGES.md

Author: huangguangshan

CHANGES.md

@@ -19,7 +19,7 @@ Release Notes.
 * Fix Jetty client cannot receive the HTTP response body.
 * Eliminate repeated code with HttpServletRequestWrapper in mvc-annotation-commons.
 * Add the jdk httpclient plugin.
-
+* Fix Gateway 2.0.x plugin not activated for spring-cloud-starter-gateway 2.0.0.RELEASE.
 All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/242?closed=1)
 
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