-r requirements.txt
pip==8.1.2
bumpversion==0.5.3
wheel==0.29.0
watchdog==0.8.3
flake8==3.0.4
tox==2.4.1
coverage==4.2
Sphinx==1.4.8
nose2==0.6.5
cov-core==1.15.0
ddt==1.1.1

-r requirements.txt
pip==9.0.0
bumpversion==0.5.3
wheel==0.29.0
watchdog==0.8.3
flake8==3.0.4
tox==2.4.1
coverage==4.2
Sphinx==1.4.8
nose2==0.6.5
cov-core==1.15.0
ddt==1.1.1

Update pip from 8.1.2 to 9.0.0
Update pip from 8.1.2 to 9.0.0