checkstyle: headerFile is deprecated; replace with headerLocation

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/fileupload/trunk@1458060 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 5eb14b0..eb7bda7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -261,7 +261,7 @@
           <configLocation>${basedir}/src/checkstyle/fileupload_checks.xml</configLocation>
           <suppressionsLocation>${basedir}/src/checkstyle/checkstyle-suppressions.xml</suppressionsLocation>
           <enableRulesSummary>false</enableRulesSummary>
-          <headerFile>${basedir}/src/checkstyle/license-header.txt</headerFile>
+          <headerLocation>${basedir}/src/checkstyle/license-header.txt</headerLocation>
         </configuration>
       </plugin>
       <plugin>