Updated to parent version 20

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615208 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 8b61e1c..ea2cb68 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.apache.sling</groupId>
     <artifactId>sling</artifactId>
-    <version>19</version>
+    <version>20</version>
     <relativePath>../../../parent/pom.xml</relativePath>
   </parent>