Upgrading parent POM to latest - This closes #5

git-svn-id: https://svn.apache.org/repos/asf/cocoon/trunk@1857504 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/parent/pom.xml b/parent/pom.xml
index f3688c3..a193020 100644
--- a/parent/pom.xml
+++ b/parent/pom.xml
@@ -24,7 +24,7 @@
   <parent>
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
-    <version>17</version>
+    <version>21</version>
     <relativePath/>
   </parent>