Updated to p-u .20

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1632876 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index e78c25f..cdb6f53 100644
--- a/pom.xml
+++ b/pom.xml
@@ -114,7 +114,7 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-utils</artifactId>
-      <version>3.0.15</version>
+      <version>3.0.20</version>
     </dependency>
     <dependency>
       <groupId>commons-io</groupId>