Remove old Python versions from classifiers

Author: CeeEffEff

setup.py

@@ -14,12 +14,10 @@
     packages=setuptools.find_packages(),
     test_suite='',
     classifiers=[
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: 3.12',
         "License :: OSI Approved :: MIT License",
     ],
 )