RAT not needed for .pmd file if present

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/compress/trunk@1307799 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 6907222..63de120 100644
--- a/pom.xml
+++ b/pom.xml
@@ -247,6 +247,7 @@
             <exclude>src/test/resources/**</exclude>
             <!-- proposal text without license -->
             <exclude>PROPOSAL.txt</exclude>
+            <exclude>.pmd</exclude>
           </excludes>
         </configuration>
       </plugin>