Update to latest parent pom

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1504788 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 46f4a67..8616ebc 100755
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
     <parent>
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
-        <version>16</version>
+        <version>17</version>
     </parent>
         
     <artifactId>org.apache.sling.javax.activation</artifactId>