marshmallow==2.15.3
Flask==1.0.2
tornado==5.0.2
bottle==0.12.13
pyyaml==3.12
sphinx==1.7.5
sphinx-issues==0.4.0
sphinx-rtd-theme==0.4.0

marshmallow==2.15.3
Flask==1.0.2
tornado==5.0.2
bottle==0.12.13
pyyaml==4.1
sphinx==1.7.5
sphinx-issues==0.4.0
sphinx-rtd-theme==0.4.0

Update pyyaml from 3.12 to 4.1
Update pyyaml from 3.12 to 4.1