[setup.py] add Py 3.8 classifier

Author: chrissimpkins

setup.py

@@ -82,6 +82,7 @@
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
         "Topic :: Text Processing :: Fonts",
         "Topic :: Multimedia :: Graphics",
         "Topic :: Multimedia :: Graphics :: Graphics Conversion",