[MPOM-94] Upgrade maven-war-plugin to 2.6

git-svn-id: https://svn.apache.org/repos/asf/maven/pom/trunk@1711659 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/asf/pom.xml b/asf/pom.xml
index 343d98e..1d53117 100644
--- a/asf/pom.xml
+++ b/asf/pom.xml
@@ -277,7 +277,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-war-plugin</artifactId>
-          <version>2.5</version>
+          <version>2.6</version>
         </plugin>
         <plugin>
           <groupId>org.apache.rat</groupId>