Update feature maven-publish

Add artifact plugin.yml

Author: rainboyan

features/maven-publish/skeleton/build.gradle

@@ -12,6 +12,11 @@ publishing {
             }
             from components.java
 
+            afterEvaluate {
+                artifact source: "${project.sourceSets.main.groovy.outputDir}/META-INF/grails-plugin.xml",
+                        classifier: "plugin",
+                        extension: 'xml'
+            }
             pom {
                 name = "My Plugin"
                 description = "My first plugin"