Merge pull request #2739 from cclauss/setup.py-py38-py39

setup.py: Add support for Python 3.8 and 3.9

Author: aiordache

setup.py

@@ -84,6 +84,8 @@
         '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',
         'Topic :: Software Development',
         'Topic :: Utilities',
         'License :: OSI Approved :: Apache Software License',