sudo: false
language: python
python:
  - "2.7"
install:
  - pip install tox-travis
script: tox

sudo: false
language: python
python:
  - "2.7"
  - "3.4"
  - "3.5"
  - "3.6"
  - "3.7"
install:
  - pip install tox-travis
script: tox

Add Python 3 version to Travis config.
Add Python 3 version to Travis config.
