Add Python 3.14 trove classifier

Author: mgorny

setup.py

@@ -111,6 +111,7 @@ def read(*names, **kwargs):
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
         'Programming Language :: Python :: 3.13',
+        'Programming Language :: Python :: 3.14',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
         # uncomment if you test on these interpreters: