Update checkstyle version

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1592598 13f79535-47bb-0310-9956-ffa450edef68

Author: britter

pom.xml

@@ -131,7 +131,7 @@ CSV files of various types.
         Use 2.9.1 instead of 2.10; 2.10 seems to scan the 'target' dir
         and wants license headers in .properties to be the header for Java files.
     -->
-    <checkstyle.version>2.12</checkstyle.version>
+    <checkstyle.version>2.12.1</checkstyle.version>
     <checkstyle.header.file>${basedir}/LICENSE-header.txt</checkstyle.header.file>
   </properties>