Add --set as an alias for --update

Because I found myself writing

    check-python-versions --set 3.10-3.14

and having to go back and change the --set to --update.

Author: mgedmin

CHANGES.rst

@@ -9,6 +9,8 @@ Changelog
 - Mention the ``--allow-non-packages`` option when showing the error message
   that rejects non-packages.
 
+- Add ``--set`` as an alias for ``--update``.
+
 
 0.23.0 (2025-10-14)
 -------------------

src/check_python_versions/cli.py

@@ -390,7 +390,8 @@ def _main() -> None:
     group.add_argument('--drop', metavar='VERSIONS', type=parse_version_list,
                        help='drop these versions from supported ones, e.g'
                             ' --drop 2.6,3.4')
-    group.add_argument('--update', metavar='VERSIONS', type=parse_version_list,
+    group.add_argument('--update', '--set', metavar='VERSIONS',
+                       type=parse_version_list,
                        help='update the set of supported versions, e.g.'
                             ' --update 2.7,3.5-3.7')
     group.add_argument('--diff', action='store_true',