INFRA-15791: Update to latest RAT 

while preparing travis badge


git-svn-id: https://svn.apache.org/repos/asf/creadur/whisker/trunk@1821425 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 926fdba..f7863a7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -253,9 +253,10 @@
         <plugin>
           <groupId>org.apache.rat</groupId>
           <artifactId>apache-rat-plugin</artifactId>
-          <version>0.11</version>
+          <version>0.12</version>
           <configuration>
             <excludes>
+              <exclude>README.md</exclude>
               <exclude>.travis.yml</exclude>
               <exclude>src/site/resources/*.dia</exclude>
             </excludes>