language: python
python:
  - 2.6
  - 2.7
  - 3.3
  - 3.4
install: pip install versiontools --use-mirrors
script:  python setup.py test

language: python
python:
  - 2.7
  - 3.4
  - 3.5
install: pip install versiontools --use-mirrors
script:  python setup.py test

Drop 2.6 and 3.3, add 3.5.
Drop 2.6 and 3.3, add 3.5.