Update supported python versions

Signed-off-by: Hui Peng <benquike@gmail.com>

Author: benquike

setup.py

@@ -50,11 +50,11 @@
         'License :: OSI Approved :: BSD License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
         'Topic :: Internet :: WWW/HTTP',
         'Topic :: Text Processing :: Markup :: HTML',
     ],