use Sling Parent 30

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1785622 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index d5b3c6d..f8d1ab1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
     <parent>
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
-        <version>28</version>
+        <version>30</version>
         <relativePath />
     </parent>