Drop python 3.7 support, add 3.13

Author: jelmer

README.md

@@ -7,6 +7,7 @@
 Python 3+ compatible port of the [configobj](https://pypi.python.org/pypi/configobj/) library.
 
 The Github CI/CD Pipeline runs tests on python versions:
+- 3.8
 - 3.9
 - 3.10
 - 3.11

setup.py

@@ -81,6 +81,7 @@
     'License :: OSI Approved :: BSD License',
     'Programming Language :: Python',
     'Programming Language :: Python :: 3',
+    'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3.9',
     'Programming Language :: Python :: 3.10',
     'Programming Language :: Python :: 3.11',
@@ -108,7 +109,7 @@
     py_modules=MODULES,
     package_dir={'': 'src'},
     packages=PACKAGES,
-    python_requires='>=3.7',
+    python_requires='>=3.8',
     classifiers=CLASSIFIERS,
     keywords=KEYWORDS,
     license='BSD-3-Clause',