Set version to 5.9.0-SNAPSHOT in POM

Author: acogoluegnes

pom.xml

@@ -4,7 +4,7 @@
 
   <groupId>com.rabbitmq</groupId>
   <artifactId>amqp-client</artifactId>
-  <version>5.8.1-SNAPSHOT</version>
+  <version>5.9.0-SNAPSHOT</version>
   <packaging>jar</packaging>
 
   <name>RabbitMQ Java Client</name>