updated version to 2.3.1

examples/org.yakindu.sct.examples.trafficlight/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: Yakindu Statechart Tools (SCT) TrafficLight Example
 Bundle-SymbolicName: org.yakindu.sct.examples.trafficlight
-Bundle-Version: 2.2.0.qualifier
+Bundle-Version: 2.3.1.qualifier
 Export-Package: org.yakindu.sct.examples.java.trafficlight
 Require-Bundle: org.eclipse.draw2d;bundle-version="3.7.0"
 Bundle-RequiredExecutionEnvironment: J2SE-1.5