language: python
python:
  - "3.6"
  - "3.7"
install:
  - pip install pipenv
  - pipenv install --dev
  - invoke -c build_tasks build-all
script:
  - invoke test

language: python
python:
  - "3.6"
matrix:
  include:
    - python: 3.7
      dist: xenial    # required for Python 3.7 (travis-ci/travis-ci#9069)
      sudo: required  # required for Python 3.7 (travis-ci/travis-ci#9069)
install:
  - pip install pipenv
  - pipenv install --dev
  - invoke -c build_tasks build-all
script:
  - invoke test

Fix Python 3.7 on CI
Fix Python 3.7 on CI