bump to released version of plexus-interpolation

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@820349 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index c811a71..ae1100a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -83,7 +83,7 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-interpolation</artifactId>
-      <version>1.13-SNAPSHOT</version>
+      <version>1.13</version>
     </dependency>
 
     <dependency>