updated version to 2.3.1 in POM too now

examples/org.yakindu.sct.examples.trafficlight/pom.xml

@@ -8,7 +8,7 @@
 		</parent -->
 	<groupId>org.yakindu.sct.examples</groupId>
 	<artifactId>org.yakindu.sct.examples.trafficlight</artifactId>
-	<version>2.3.0-SNAPSHOT</version>
+	<version>2.3.1-SNAPSHOT</version>
 	<packaging>pom</packaging>
 
 	<properties>