Upgrade ZooKeeper to 3.4.8
diff --git a/parent/pom.xml b/parent/pom.xml
index cc143f5..52f5d6d 100644
--- a/parent/pom.xml
+++ b/parent/pom.xml
@@ -45,7 +45,7 @@
         <felix.version>5.4.0</felix.version>
         <spring.version>4.2.4.RELEASE</spring.version>
         <spring.osgi.version>1.2.1</spring.osgi.version>
-        <zookeeper.version>3.4.7</zookeeper.version>
+        <zookeeper.version>3.4.8</zookeeper.version>
 
         <remote.service.admin.interfaces.version>1.0.0</remote.service.admin.interfaces.version>