override PMD version used by PMD plugin

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/compress/trunk@1635934 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index df58168..f9bd7a4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -187,6 +187,19 @@
           </ignorePathsToDelete>
         </configuration>
       </plugin>
+      <!-- use PMD 5.1.3 because of false positives for "unused private method" -->
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-pmd-plugin</artifactId>
+        <version>3.2</version>
+        <dependencies>
+          <dependency>
+            <groupId>net.sourceforge.pmd</groupId>
+            <artifactId>pmd</artifactId>
+            <version>5.1.3</version>
+          </dependency>
+        </dependencies>
+      </plugin>
     </plugins>
   </build>