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 c8ca598..50ea76d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -105,7 +105,7 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-utils</artifactId>
-      <version>3.0.18</version>
+      <version>3.0.20</version>
     </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>