Upgrade to checkstyle 4.0

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@351475 13f79535-47bb-0310-9956-ffa450edef68

checkstyle/project.xml

@@ -147,7 +147,7 @@
     <dependency>
       <groupId>checkstyle</groupId>
       <artifactId>checkstyle</artifactId>
-      <version>4.0-beta6</version>
+      <version>4.0</version>
       <properties>
         <classloader>root</classloader>
       </properties>
@@ -155,7 +155,7 @@
     <dependency>
       <groupId>checkstyle</groupId>
       <artifactId>checkstyle-optional</artifactId>
-      <version>4.0-beta6</version>
+      <version>4.0</version>
       <properties>
         <classloader>root</classloader>
       </properties>