travis: Test also with Python 3.8 and 3.9.

iamahuman · timabbott · commit e2b295c5f4df · 2021-01-18T05:32:54.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,6 +5,8 @@ python:
 - '3.5'
 - '3.6'
 - '3.7'
+- '3.8'
+- '3.9'
 install: pip install flake8 tox-travis
 
 services:
