Update to Sling Parent POM 22 with baselining enabled

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1628620 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 766911f..9970105 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
   <parent>
     <groupId>org.apache.sling</groupId>
     <artifactId>sling</artifactId>
-    <version>20</version>
+    <version>22</version>
   </parent>
 
   <artifactId>org.apache.sling.extensions.datasource</artifactId>