coverage==4.2
flake8==3.0.4
invoke==0.14.0
pylint==1.6.4
pytest==3.0.3
pytest-cov==2.3.1
Sphinx==1.4.8
sphinx-rtd-theme==0.1.9
tox==2.3.1
twine==1.8.1
wheel==0.29.0
-r requirements.txt

coverage==4.3.1
flake8==3.2.1
invoke==0.14.0
pylint==1.6.4
pytest==3.0.5
pytest-cov==2.4.0
Sphinx==1.5.1
sphinx-rtd-theme==0.1.9
tox==2.5.0
twine==1.8.1
wheel==0.29.0
-r requirements.txt

Update dev requirements to latest.
Update dev requirements to latest.
