fix wrong version in pom.xml

Author: labrenbe

authorizer/pom.xml

@@ -7,7 +7,7 @@
 
   <groupId>org.nifiopa.nifiopa</groupId>
   <artifactId>opa-authorizer</artifactId>
-  <version>0.2.0</version>
+  <version>0.3.1</version>
   <packaging>nar</packaging>
 
   <name>nifiopa</name>