[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 +7,7 @@ url = https://github.com/pytask-dev/pytask-parallel
 author = Tobias Raabe
 author_email = [email protected]
 license = MIT
-license_file = LICENSE
+license_files = LICENSE
 platforms = any
 classifiers =
     Development Status :: 4 - Beta