[MPOM-136] upgraded enforcer extra rules to 1.0-beta-6

git-svn-id: https://svn.apache.org/repos/asf/maven/pom/trunk@1768158 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/maven/pom.xml b/maven/pom.xml
index ffacbc7..4e023f7 100644
--- a/maven/pom.xml
+++ b/maven/pom.xml
@@ -1048,7 +1048,7 @@
           <dependency>
             <groupId>org.codehaus.mojo</groupId>
             <artifactId>extra-enforcer-rules</artifactId>
-            <version>1.0-beta-5</version>
+            <version>1.0-beta-6</version>
           </dependency>
         </dependencies>
       </plugin>