Update setup.cfg

- drop support for 3.9
- add support for 3.13

setup.cfg

@@ -2,7 +2,7 @@
 description-file = README.md
 license_files = LICENSE
 name = purpleair_api
-version = 1.2.0
+version = 1.3.0
 author = Carlos Santos
 author_email = [email protected]
 license = MIT
@@ -20,6 +20,10 @@ long_description_content_type = text/markdown
 platforms = Windows 32/64, Linux 32/64, MacOS 32/64
 
 [options]
-python_requires = >=3.8
 packages = purpleair_api
-install_requires = requests
+install_requires = requests
+python_requires = >=3.9,<3.14
+
+[tool:black]
+line-length = 100
+target-version = ['py39', 'py310', 'py311', 'py312', 'py313']