message: Add Python 3.8 classifier to setup.py
diff: @@ -128,6 +128,7 @@ setup(
  "Programming Language :: Python :: 3 :: Only",
  "Programming Language :: Python :: 3.6",
  "Programming Language :: Python :: 3.7",
  + "Programming Language :: Python :: 3.8",
  "Operating System :: MacOS :: MacOS X",
  "Operating System :: POSIX :: Linux",
  ],
  