-r requirements.txt
django==2.1.7
bumpversion==0.5.3
wheel==0.33.1
django-environ==0.4.5
radon==3.0.1
pytz==2018.9
djangorestframework==3.9.2

-r requirements.txt
django==2.1.7
bumpversion==0.5.3
wheel==0.33.1
django-environ==0.4.5
radon==3.0.1
pytz==2019.1
djangorestframework==3.9.2

Update pytz from 2018.9 to 2019.1
Update pytz from 2018.9 to 2019.1