upgrade the version to 1.4.0

Author: casionone

pom.xml

@@ -102,7 +102,7 @@
     </snapshotRepository>
   </distributionManagement>
   <properties>
-    <revision>1.4.0-SNAPSHOT</revision>
+    <revision>1.4.0</revision>
 
     <zookeeper.version>3.5.9</zookeeper.version>
     <curator.version>4.2.0</curator.version>