chardet
PyYAML
python-dateutil
Werkzeug
Whoosh
tabview
twine

PyYAML>=2.12
Werkzeug>=0.13
Whoosh>=2.7.4
chardet>=3.0.4
pip>=9.0
python-dateutil>=2.6.1
tabview>=1.4.3
twine>=1.9.1

Add required versions to required.txt
Add required versions to required.txt
