language: python
python:
 - "3.5"
 - "3.6"
env:
 - HYPOTHESIS_PROFILE=ci
script: make test lint

language: python
dist: xenial
python:
 - "3.5"
 - "3.6"
 - "3.7"
env:
 - HYPOTHESIS_PROFILE=ci
script: make test lint

Add python 3.7 (attempt 2)
Add python 3.7 (attempt 2)

https://docs.travis-ci.com/user/languages/python/#python-37-and-higher
