Update setup.py (#1361)

updated classifiers

setup.py

@@ -249,7 +249,8 @@ setup(name='deepspeed',
       classifiers=[
           'Programming Language :: Python :: 3.6',
           'Programming Language :: Python :: 3.7',
-          'Programming Language :: Python :: 3.8'
+          'Programming Language :: Python :: 3.8',
+          'Programming Language :: Python :: 3.9'
       ],
       license='MIT',
       ext_modules=ext_modules,