Updated version number to v1.8.1

ChangeLog

+=======
+1.8.1 RELEASE (2023/11)
+Improvements and enhancements
+        - Enhancement of the Dockerfiles for testing and reference-installation
+          - Docker Compose introduced ./docker-compose*.yml 
+
+        - Fixed broken Menubar
+
+	- Updated arrangement of the buttons in the rules table view; fix sorting of entries in table default by name again; dont reset paging on reload
+
+        - Reenable possibility to set expire date when creating a rule via REST API
+
+	- Apply check sync also for out-of-sync-rules
+
+	- Bugfixes required for newer Django version
+
 =======
 1.8.0 RELEASE (2023/05)
 Improvements and enhancements

_version.py

 #VERSION = '1.5'
-VERSION = '1.8.0'
+#VERSION = '1.8.0'
+VERSION = '1.8.1'
 
 if __name__ == "__main__":
     print(VERSION)