dist: xenial
sudo: required
language: python
python:
  - 2.7
  - 3.4
  - 3.5
  - 3.6
  - 3.7
  - pypy
  - pypy3
install:
  - pip install flake8
  - pip install coverage
  - pip install coveralls
  - pip install mock
  - pip install nose
script:
  - make tests-coverage
  - make lint
after_success:
  - coveralls

language: python
python:
  - 2.7
  - 3.4
  - 3.5
  - 3.6
  - pypy
  - pypy3
install:
  - pip install flake8
  - pip install coverage
  - pip install coveralls
  - pip install mock
  - pip install nose
script:
  - make tests-coverage
  - make lint
after_success:
  - coveralls

Revert "Another try to check with Python 3.7 in Travis CI."
Revert "Another try to check with Python 3.7 in Travis CI."

This reverts commit cd21b152e398ab955f56a959104b5e766bb668f8.

Also does not work (cannot install pypy and pypy3).
