Update to latest ASF parent pom


git-svn-id: https://svn.apache.org/repos/asf/creadur/tentacles/trunk@1838675 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 5cf6f96..2d8ec8d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
-    <version>18</version>
+    <version>20</version>
   </parent>
   <groupId>org.apache.creadur.tentacles</groupId>
   <artifactId>apache-tentacles</artifactId>