Update tox.ini

Author: jmbraybrook

tox.ini

@@ -1,6 +1,6 @@
 # content of: tox.ini , put in same dir as setup.py
 [tox]
-envlist = python3.10, python3.11, python3.12, python3.13
+envlist = python3.10, python3.11, python3.12, python3.13, python3.14
 
 [testenv]
 # install pytest in the virtualenv where commands will be executed