flake8==3.6.0
pytest==3.10.1
pytest-cov==2.6.0
pytest-asyncio==0.9.0; python_version >= '3.4'

flake8==3.6.0
pytest==3.10.1
pytest-cov==2.6.0
pytest-asyncio==0.5.0; python_version >= '3.4' and python_version < '3.5'
pytest-asyncio==0.9.0; python_version >= '3.5'

Use older pytest-async for 3.4
Use older pytest-async for 3.4

Newer pytest-async blows up on python 3.4.
