Add missing description

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@293411 13f79535-47bb-0310-9956-ffa450edef68

changelog/project.xml

@@ -23,6 +23,7 @@
   <id>maven-changelog-plugin</id>
   <name>Maven Changelog Plugin</name>
   <currentVersion>1.9-SNAPSHOT</currentVersion>
+  <description>The Changelog plugin generates reports about recent changes to the SCM repository.</description>
   <shortDescription>Produce SCM changelog reports.</shortDescription>
   <url>http://maven.apache.org/reference/plugins/changelog/</url>
   <issueTrackingUrl>http://jira.codehaus.org/browse/MPCHANGELOG</issueTrackingUrl>