add requires-python config

cookiecutter.json

@@ -10,6 +10,5 @@
     "package_bug_tracker_path": "-/issues",
     "package_bug_tracker_url": "{{ cookiecutter.package_homepage_url }}/{{ cookiecutter.package_bug_tracker_path }}",
     "virtual_env_folder": "venv",
-    "flake8_max_complexity": 10,
-    "flake8_max_line_length": 100
+    "requires-python": ">=3.8"
 }
\ No newline at end of file

{{ cookiecutter.package_name }}/pyproject.toml

@@ -10,7 +10,7 @@ authors = [
 ]
 description = "{{ cookiecutter.package_description }}"
 readme = "README.md"
-requires-python = ">=3.7"
+requires-python = "{{ cookiecutter.requires-python }}"
 classifiers = [
     "Programming Language :: Python :: 3",
     "License :: OSI Approved :: MIT License",