sudo: false
language: python
install:
      - pip install tox
script:
      - tox
matrix:
    include:
        - python: 2.7
          env: TOXENV=py27
        - python: 3.5
          env: TOXENV=py35
        - python: 3.6
          env: TOXENV=py36
        - python: 3.7
          env: TOXENV=py37
          dist: xenial
          sudo: true
        - python: pypy
          env: TOXENV=pypy