Bump djangorestframework from 3.11.0 to 3.11.2

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.11.0 to 3.11.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.11.0...3.11.2)

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

Author: dependabot[bot]

requirements.txt

@@ -17,7 +17,7 @@ django-js-asset==1.2.2
 django-mptt==0.12.0
 django-rest-framework==0.1.0
 django-rest-swagger==2.2.0
-djangorestframework==3.11.0
+djangorestframework==3.11.2
 drfpasswordless==1.5.7
 html5lib==1.0.1
 idna==2.8