Final 2.3.1 release

Author: czengler

pom.xml

@@ -26,7 +26,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.logicng</groupId>
   <artifactId>logicng</artifactId>
-  <version>2.3.0</version>
+  <version>2.3.1</version>
   <packaging>bundle</packaging>
 
   <name>LogicNG</name>