RAT-228: Update to latest maven antrun plugin


git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/trunk@1792819 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 14fb0fc..5f796cd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -284,7 +284,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-antrun-plugin</artifactId>
-          <version>1.7</version>
+          <version>1.8</version>
           <dependencies>
             <dependency>
               <groupId>org.apache.ant</groupId>