[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

setup.cfg

@@ -6,7 +6,7 @@ long_description_content_type = text/x-rst
 url = https://github.com/pupil-labs/pye3d-detector
 author = Pupil Labs GmbH
 author_email = info@pupil-labs.com
-license_file = LICENSE
+license_files = LICENSE
 classifiers =
     Development Status :: 5 - Production/Stable
     License :: OSI Approved :: MIT License