exclude README.md in rat report

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1732095 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 98251a6..0c4ff92 100644
--- a/pom.xml
+++ b/pom.xml
@@ -125,6 +125,20 @@
             </plugin>
 
         </plugins>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <!-- Extend RAT configuration from parent pom -->
+                    <groupId>org.apache.rat</groupId>
+                    <artifactId>apache-rat-plugin</artifactId>
+                    <configuration>
+                        <excludes combine.children="append">
+                            <exclude>README.md</exclude>
+                        </excludes>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </pluginManagement>
     </build>
 
 </project>