Set pom version to 1.4.0-SNAPSHOT

Author: acogoluegnes

pom.xml

@@ -4,7 +4,7 @@
 
   <groupId>com.rabbitmq</groupId>
   <artifactId>perf-test</artifactId>
-  <version>1.4.0.RC1</version>
+  <version>1.4.0-SNAPSHOT</version>
   <packaging>jar</packaging>
 
   <name>RabbitMQ Performance Testing Tool</name>