sudo: false
language: python
python:
 - "2.7"
 - "3.4"
 - "3.5"
 - "3.6"
install: "pip install -e ."
script: nose2

sudo: true
dist: xenial
language: python
python:
 - "2.7"
 - "3.5"
 - "3.6"
 - "3.7"
install: "pip install -e ."
script: nose2

Add 3.7 to build matrix, remove 3.4
Add 3.7 to build matrix, remove 3.4
