Update trove classifiers with newer Python

Author: browniebroke

setup.py

@@ -36,6 +36,8 @@ def read(*names, **kwargs):
 Programming Language :: Python :: 3.4
 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
 Topic :: Software Development :: Quality Assurance