Fix messaging sample (#19)

Author: arminru

samples/messaging/pom.xml

@@ -6,14 +6,14 @@
 
   <groupId>com.dynatrace.oneagent.sdk.samples.messaging</groupId>
   <artifactId>messaging-sample</artifactId>
-  <version>1.5.0</version>
+  <version>1.6.0</version>
   <packaging>jar</packaging>
 
   <dependencies>
 	<dependency>
 	  <groupId>com.dynatrace.oneagent.sdk.java</groupId>
 	  <artifactId>oneagent-sdk</artifactId>
-	  <version>1.5.0</version>
+	  <version>1.6.0</version>
 	  <scope>compile</scope>
 	</dependency>
   </dependencies>