[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

@@ -17,6 +17,7 @@ classifiers =
     Operating System :: OS Independent
     Programming Language :: Python
     Programming Language :: Python :: 3
+    Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: PyPy
     Topic :: Software Development :: Libraries :: Python Modules
     Topic :: Software Development :: Quality Assurance
@@ -27,6 +28,7 @@ py_modules = flake8_import_order
 install_requires =
     pycodestyle
     setuptools
+python_requires = >=3.9
 python_requires > = 3.9
 tests_require =
     pytest