Added new managed version of Python.

Author: fedelemantuano

setup.py

@@ -64,6 +64,8 @@
         "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",
     ],
     install_requires=requires,
     entry_points={'console_scripts': [