tox --help shows an error when run outside a directory with tox support files

[Julian]

[This is obviously minor, but figured I'd file it anyhow]

Running tox --help to just check usage options from no directory in particular (one that doesn't have a tox.ini etc.) shows an error:

⊙  tox --help                                                                                                                                                                                     julian@Air
ERROR: tox config file (either pyproject.toml, tox.ini, setup.cfg) not found
usage: tox [--version] [-h] [--help-ini] [-v] [-q] [--showconfig] [-l] [-a] [-c CONFIGFILE] [-e envlist] [--devenv ENVDIR] [--notest] [--sdistonly] [-p VAL] [-o] [--parallel--safe-build]
           [--installpkg PATH] [--develop] [-i URL] [--pre] [-r] [--result-json PATH] [--hashseed SEED] [--force-dep REQ] [--sitepackages] [--alwayscopy] [-s [val]] [--workdir PATH]
           [args [args ...]]

tox options
...

⊙  tox --version                                                                                                                                                                                  julian@Air
3.14.3 imported from /Users/julian/.local/share/virtualenvs/tox/site-packages/tox/__init__.py