Template for Travis CI integration

.travis.yml

language: python
python:
    - "2.7"
    - "3.4"
    - "3.5"
    - "3.6"
    - "3.7"
before_install:
    - pip install -r requirements.txt
install:
    - pip install -e .
script:
    - py.test --cov .
after_success:
  coveralls