[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/OpenSourceEconomics/pybaum
 author = Janos Gabler, Tobias Raabe
 author_email = [email protected]
 license = MIT
-license_file = LICENSE
+license_files = LICENSE
 platforms = unix, linux, osx, cygwin, win32
 classifiers =
     Development Status :: 3 - Alpha
@@ -22,7 +22,7 @@ classifiers =
 
 [options]
 packages = find:
-python_requires = >=3.7
+python_requires = >=3.8
 include_package_data = True
 package_dir =
     =src