Update setup.cfg

Co-Authored-By: Steve Piercy <web@stevepiercy.com>

Author: digitalresistor

setup.cfg

@@ -17,6 +17,7 @@ classifiers =
     Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: Implementation :: PyPy
     Operating System :: OS Independent