correct the user-agent property name (#8)

* correct the user-agent property name

* add new line

Co-authored-by: bailiu <bailiu@microsoft.com>

src/main/java/com/microsoft/azure/servicebus/jms/ServiceBusJmsConnectionFactory.java

@@ -72,7 +72,8 @@ public class ServiceBusJmsConnectionFactory implements ConnectionFactory, QueueC
             if (customUserAgent != null && customUserAgent.length() > 0) {
                 userAgent.append("/").append(customUserAgent);
             }
-            properties.put("userAgent", userAgent.toString());
+            
+            properties.put("user-agent", userAgent.toString());
 
             return properties;
         });