Add Python 3.8 to the tox matrix (#135)
Add Python 3.8 to the tox matrix (#135)

Allows contributors to easily run the full test matrix locally.

Python 3.8 was released on on October 14th, 2019.

https://docs.python.org/3/whatsnew/3.8.html
pyparsing/pyparsing,pyparsing/pyparsing