Fix rat failure

pom.xml

@@ -411,7 +411,6 @@
           <artifactId>maven-checkstyle-plugin</artifactId>
           <version>2.15</version>
           <configuration>
-            <headerLocation>src/checkstyle/header-file.txt</headerLocation>
             <configLocation>src/checkstyle/checkstyle.xml</configLocation>
           </configuration>
           <executions>

src/checkstyle/checkstyle.xml

@@ -3,7 +3,22 @@
     "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
     "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
 <!--
- Derived from checkstlye's Sun code style config
+ Copyright (C) 2015 ZXing authors
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ -->
+<!--
+ Derived from checkstyle's Sun code style config
  -->
 <module name="Checker">
   <!--
@@ -81,8 +96,6 @@
     <module name="TypeName"/>
 
 
-
-
     <!-- Checks for imports                              -->
     <!-- See http://checkstyle.sf.net/config_import.html -->
     <module name="AvoidStarImport"/>