updated parent pom

git-svn-id: https://svn.apache.org/repos/asf/maven/doxia/doxia/trunk@1670510 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 8d6a028..b0d269d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
   <parent>
     <groupId>org.apache.maven</groupId>
     <artifactId>maven-parent</artifactId>
-    <version>25</version>
+    <version>26</version>
     <relativePath>../../pom/maven/pom.xml</relativePath>
   </parent>
 
@@ -388,7 +388,7 @@
         <groupId>org.apache.rat</groupId>
         <artifactId>apache-rat-plugin</artifactId>
         <configuration>
-          <excludes>
+          <excludes combine.children="append">
             <exclude>src/test/resources/**/*.apt</exclude>
             <exclude>src/test/resources/**/*.apt.vm</exclude>
             <exclude>src/test/resources/**/*.confluence</exclude>