-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==2.2.1
bumpversion==0.5.3
wheel==0.33.1
django-environ==0.4.5
radon==3.0.1
pytz==2018.9
djangorestframework==3.9.2

Update django from 2.1.7 to 2.2.1
Update django from 2.1.7 to 2.2.1