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

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

Author: pre-commit-ci[bot]

setup.cfg

@@ -7,7 +7,6 @@ url = https://github.com/pupil-labs/realtime-python-api
 author = Pupil Labs GmbH
 author_email = [email protected]
 license = MIT
-license_file = LICENSE
 license_files = LICENSE
 classifiers =
     Development Status :: 5 - Production/Stable