[tox]
envlist = py34, py33, py27, pypy

[testenv]
deps = -r{toxinidir}/dev_requirements.txt
       nose
commands = nosetests {posargs}

[tox]
envlist = py35, py34, py33, py27, pypy

[testenv]
deps = -r{toxinidir}/dev_requirements.txt
       nose
commands = nosetests {posargs}

Add Python 3.5 to the build targets
Add Python 3.5 to the build targets