language: python
cache: pip
matrix:
  include:
    - python: 2.7
    - python: 3.4
    - python: 3.5
    - python: 3.6
    - python: pypy
    - python: pypy-5.3
    - python: pypy3
    - python: 3.7
      dist: xenial
    - python: nightly
      dist: xenial
install: pip install tox
script: tox -e py