Add additional python version compatibility

Author: jhodges10

setup.py

@@ -47,9 +47,11 @@ def run(self):
     'Programming Language :: Python :: 2',
     'Programming Language :: Python :: 2.7',
     'Programming Language :: Python :: 3',
+    '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',
   ],
   description='Client library for the Frame.io API',
   long_description=long_description,