Update requirements

babel==2.3.4

mock==2.0.0

babel==2.7.0

mock==3.0.5

pycodestyle==2.5.0

flake8==3.7.7

flake8==3.7.9

mockredispy==2.9.3

pytest==5.3.2

pytest-cov==2.8.1

flask==1.0.2

flask==1.1.1

jinja2==2.10.1

flask-babel==0.12.2

lxml==4.3.3

pygments==2.1.3

python-dateutil==2.8.0

pyyaml==5.1

lxml==4.4.2

pygments==2.5.2

python-dateutil==2.8.1

pyyaml==5.2

requests[socks]==2.22.0

redis==3.2.1

redis==3.3.11