use newest parent

pom.xml

diff --git a/pom.xml b/pom.xml
index b097575..036bb85 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
-        <version>30</version>
+        <version>32</version>
         <relativePath />
     </parent>