sudo: false
language: python
python:
  - "2.7"
  - "3.3"
  - "3.4"
  - "3.5"
install:
  - pip install tox coveralls
script:
  - tox -e py${TRAVIS_PYTHON_VERSION//[.]/}
after_success:
  - coveralls

language: python
python:
  - "2.7"
  - "3.3"
  - "3.4"
  - "3.5"
install:
  - pip install tox coveralls
script:
  - tox -e py${TRAVIS_PYTHON_VERSION//[.]/}
after_success:
  - coveralls

Remove now default 'sudo: false'
Remove now default 'sudo: false'

'sudo: false' is now default on Travis CI.