fix : minor edit in setup.py

Author: sepandhaghighi

setup.py

@@ -48,6 +48,8 @@ def read_description():
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
         'Topic :: Scientific/Engineering',
     ],
     install_requires=get_requires(),