updating to latest apache parent pom release

git-svn-id: https://svn.apache.org/repos/asf/incubator/photark/trunk@1037599 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index e62aa28..cb0c424 100644
--- a/pom.xml
+++ b/pom.xml
@@ -21,7 +21,7 @@
     <parent>
         <groupId>org.apache</groupId>
         <artifactId>apache</artifactId>
-        <version>4</version>
+        <version>7</version>
     </parent>
 
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