Update setup.py

Author: gonchik

setup.py

@@ -59,6 +59,8 @@
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'Topic :: Utilities',
         'Topic :: Internet',
         'Topic :: Internet :: WWW/HTTP',