[MARCHETYPE-596] update xmlunit (#42)

* update xmlunit
* update enforcer rules
diff --git a/pom.xml b/pom.xml
index 41a3e42..bb2798f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -244,7 +244,7 @@
       <dependency>
         <groupId>org.xmlunit</groupId>
         <artifactId>xmlunit-matchers</artifactId>
-        <version>2.6.0</version>
+        <version>2.6.4</version>
       </dependency>
     </dependencies>
   </dependencyManagement>
@@ -320,7 +320,7 @@
           <dependency>
             <groupId>org.codehaus.mojo</groupId>
             <artifactId>extra-enforcer-rules</artifactId>
-            <version>1.0-beta-6</version>
+            <version>1.2</version>
           </dependency>
         </dependencies>
       </plugin>