solidfied the Python3 only mindset

Author: mahtin

setup.py

@@ -43,7 +43,16 @@ def main():
             'Intended Audience :: Developers',
             'Topic :: Software Development :: Libraries :: Python Modules',
             'License :: OSI Approved :: MIT License',
+            'Programming Language :: Python',
             'Programming Language :: Python :: 3'
+            'Programming Language :: Python :: 3.5',
+            '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 :: Only',
         ]
     )