Update supported Python versions in classifiers (#24)

Author: bennylope

setup.py

@@ -33,14 +33,12 @@
           'Intended Audience :: Developers',
           'License :: OSI Approved :: ISC License (ISCL)',
           'Operating System :: OS Independent',
-          'Programming Language :: Python :: 2',
-          'Programming Language :: Python :: 2.7',
           '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',
           'Topic :: Software Development :: Libraries :: Python Modules',
     ],