Bump djangorestframework from 3.8.2 to 3.11.2

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.8.2 to 3.11.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.8.2...3.11.2)

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

Author: dependabot[bot]

Pipfile

@@ -10,7 +10,7 @@ chardet = "==3.0.4"
 idna = "==2.7"
 python-decouple = "==3.1"
 "urllib3" = "==1.23"
-djangorestframework = "==3.8.2"
+djangorestframework = "==3.11.2"
 pytz = "==2018.5"
 Django = "==2.1.1"
 

Pipfile.lock

@@ -1,7 +1,8 @@
+-i https://pypi.org/simple/
 certifi==2018.4.16
 chardet==3.0.4
-Django==2.1.1
-djangorestframework==3.8.2
+django==2.1.1
+djangorestframework==3.11.2
 idna==2.7
 python-decouple==3.1
 pytz==2018.5