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 daf7cdc..232db51 100644
--- a/pom.xml
+++ b/pom.xml
@@ -16,7 +16,7 @@
 	<parent>
 		<groupId>org.apache.sling</groupId>
 		<artifactId>sling</artifactId>
-		<version>19</version>
+		<version>20</version>
 		<relativePath>../../../parent/pom.xml</relativePath>
 	</parent>