[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

@@ -7,15 +7,11 @@ url = https://github.com/dannysepler/killport
 author = Danny Sepler
 author_email = dannysepler@gmail.com
 license = MIT
-license_file = LICENSE
+license_files = LICENSE
 classifiers =
     License :: OSI Approved :: MIT License
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.7
-    Programming Language :: Python :: 3.8
-    Programming Language :: Python :: 3.9
-    Programming Language :: Python :: 3.10
 project_urls =
     Bug Tracker = https://github.com/dannysepler/killport/issues