Update release plugin to Apache compatible version

Change-Id: Ib0bf1acb6842729a7165ad69ee33886625574f67
Reviewed-on: https://asterix-gerrit.ics.uci.edu/371
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Till Westmann <tillw@apache.org>
diff --git a/pom.xml b/pom.xml
index 98ca195..f756fce 100644
--- a/pom.xml
+++ b/pom.xml
@@ -66,7 +66,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-release-plugin</artifactId>
-                <version>2.1</version>
+                <version>2.5.2</version>
                 <configuration>
                     <goals>package source:jar javadoc:jar deploy:deploy</goals>
                 </configuration>