Use XSD

Author: garydgregory

src/changes/changes.xml

@@ -33,7 +33,9 @@
   The <action> type attribute can be add,update,fix,remove.
 -->
 
-<document>
+<document xmlns="http://maven.apache.org/changes/1.0.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/changes/1.0.0 http://maven.apache.org/xsd/changes-1.0.0.xsd">
   <properties>
     <title>Apache Commons CSV Release Notes</title>
   </properties>