python-dateutil==2.7.5
requests>=2.20.0
python-slugify==3.0.2
testtools==2.3.0

python-dateutil~=2.8.0
requests==2.22.0
python-slugify~=3.0.2
testtools==2.3.0

Update python slugify version, better versioning
Update python slugify version, better versioning