language: python
dist: trusty
python:
  - 2.7
  - 3.4
  - 3.5
  - 3.6
matrix:
  include:
    - python: 3.7
      dist: xenial
      sudo: true
services:
  - redis-server
install: "pip install -r requirements.txt"
script: python runtests.py

language: python
dist: xenial
python:
  - 2.7
  - 3.6
  - 3.7
  - 3.8
services:
  - redis-server
install: "pip install -r requirements.txt"
script: python runtests.py

Use python 3.6-8 for CI.
Use python 3.6-8 for CI.
