make --new-version really optional

[gogo2464]

When I do:;

bump2version subsubpatch .\setup.py

I got:

usage: bumpversion [-h] [--config-file FILE] [--verbose] [--list] [--allow-dirty] [--parse REGEX] [--serialize FORMAT] [--search SEARCH] [--replace REPLACE]
                   [--current-version VERSION] [--no-configured-files] [--dry-run] --new-version VERSION [--commit | --no-commit] [--tag | --no-tag]
                   [--sign-tags | --no-sign-tags] [--tag-name TAG_NAME] [--tag-message TAG_MESSAGE] [--message COMMIT_MSG] [--commit-args COMMIT_ARGS]
                   part [file ...]
bumpversion: error: the following arguments are required: --new-version

So please could you make the --new-version, really optional please!

bump2version -h usage: bumpversion [-h] [--config-file FILE] [--verbose] [--list] [--allow-dirty] [--parse REGEX] [--serialize FORMAT] [--search SEARCH] [--replace REPLACE] [--current-version VERSION] [--no-configured-files] [--dry-run] --new-version VERSION [--commit | --no-commit] [--tag | --no-tag] [--sign-tags | --no-sign-tags] [--tag-name TAG_NAME] [--tag-message TAG_MESSAGE] [--message COMMIT_MSG] [--commit-args COMMIT_ARGS] part [file ...]

bumpversion: v1.0.1 (using Python v3.10.9)