Django==1.11.1
Markdown==2.6.8
PyJWT==1.5.3
Pygments==2.2.0
Unidecode==0.04.21
certifi==2017.7.27.1
chardet==3.0.4
django-cors-headers==2.1.0
django-cors-middleware==1.3.1
django-filter==1.0.4
djangorestframework==3.6.3
djangorestframework-jwt==1.11.0
djoser==0.7.0
httpie==1.0.3
idna==2.5
psycopg2==2.7.3
python-slugify==1.2.4
pytz==2017.2
requests==2.18.3
urllib3==1.22

Django==1.11.1
Markdown==2.6.8
PyJWT==1.5.3
Pygments==2.2.0
Unidecode==0.04.21
certifi==2017.7.27.1
chardet==3.0.4
django-cors-headers==2.1.0
django-cors-middleware==1.3.1
django-filter==1.0.4
djangorestframework==3.9.1
djangorestframework-jwt==1.11.0
djoser==0.7.0
httpie==1.0.3
idna==2.5
psycopg2==2.7.3
python-slugify==1.2.4
pytz==2017.2
requests==2.18.3
urllib3==1.22

Bump djangorestframework from 3.6.3 to 3.9.1 in /backend
Bump djangorestframework from 3.6.3 to 3.9.1 in /backend

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.6.3 to 3.9.1.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](https://github.com/encode/django-rest-framework/compare/3.6.3...3.9.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>