May have multiple authors

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@354742 13f79535-47bb-0310-9956-ffa450edef68

changes/src/plugin-resources/xsd/changes.xsd

@@ -30,7 +30,7 @@
     <xs:complexType>
       <xs:sequence>
         <xs:element ref="title"/>
-        <xs:element ref="author" minOccurs="0"/>
+        <xs:element ref="author" minOccurs="0" maxOccurs="unbounded"/>
       </xs:sequence>
     </xs:complexType>
   </xs:element>