Update classifiers

Author: taizan-hokuto

setup.py

@@ -50,8 +50,9 @@ def _test_requirements():
         'Natural Language :: Japanese',
         'Development Status :: 4 - Beta',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 3.7',        
-        'Programming Language :: Python :: 3.8',        
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',       
         'License :: OSI Approved :: MIT License',
     ],
     description="a python library for fetching youtube live chat.",