Update classifiers

Author: orivej

setup.py

@@ -49,11 +49,11 @@
     'License :: OSI Approved :: MIT License',
     'Programming Language :: Python',
     'Programming Language :: Python :: 2.7',
-    'Programming Language :: Python :: 3.3',
     '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',
     'Programming Language :: Python :: Implementation :: CPython',
     'Operating System :: OS Independent',
     'Topic :: Software Development :: Libraries',