language: python
python:
  - 2.7
  - 3.3
  - 3.4

install:
  - python setup.py develop
  - pip install -r requirements-dev.txt

script:
  - mamba

language: python
python:
  - 2.7
  - 3.3
  - 3.4
  - 3.5
  - 3.6
  - 3.7

install:
  - python setup.py develop
  - pip install -r requirements-dev.txt

script:
  - mamba

Use python 3.5, 3.6 and 3.7 for Travis
[INTERNAL] Use python 3.5, 3.6 and 3.7 for Travis
