Update Maven Checktyle Plugin from 2.7 to 3.0.0.

Author: Gary Gregory

pom.xml

@@ -150,7 +150,7 @@ CSV files of various types.
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <commons.encoding>UTF-8</commons.encoding>
 
-    <checkstyle.version>2.17</checkstyle.version>
+    <checkstyle.version>3.0.0</checkstyle.version>
     <checkstyle.header.file>${basedir}/LICENSE-header.txt</checkstyle.header.file>
     <checkstyle.resourceExcludes>LICENSE.txt, NOTICE.txt</checkstyle.resourceExcludes>