Update djangorestframework to 3.6.3

[pyup-bot]

There's a new version of djangorestframework available.
You are currently using 3.6.2. I have updated it to 3.6.3

These links might come in handy: PyPI | Changelog | Homepage

Changelog

3.6.3

Date: [12th May 2017][3.6.3-milestone]

• Raise 404 if a URL lookup results in ValidationError. ([5126][gh5126])
• Honor http_method_names on class based view, when generating API schemas. ([5085][gh5085])
• Allow overridden get_limit in LimitOffsetPagination to return all records. ([4437][gh4437])
• Fix partial update for the ListSerializer. ([4222][gh4222])
• Render JSONField control correctly in browsable API. ([4999][gh4999], [5042][gh5042])
• Raise validation errors for invalid datetime in given timezone. ([4987][gh4987])
• Support restricting doc & schema shortcuts to a subset of urls. ([4979][gh4979])
• Resolve SchemaGenerator error with paginators that have no page_size attribute. ([5086][gh5086], [3692][gh3692])
• Resolve HyperlinkedRelatedField exception on string with %20 instead of space. ([4748][gh4748], [5078][gh5078])
• Customizable schema generator classes. ([5082][gh5082])
• Update existing vary headers in response instead of overwriting them. ([5047][gh5047])
• Support passing .as_view() to view instance. ([5053][gh5053])
• Use correct exception handler when settings overridden on a view. ([5055][gh5055], [5054][gh5054])
• Update Boolean field to support 'yes' and 'no' values. ([5038][gh5038])
• Fix unique validator for ChoiceField. ([5004][gh5004], [5026][gh5026], [5028][gh5028])
• JavaScript cleanups in API Docs. ([5001][gh5001])
• Include URL path regexs in API schemas where valid. ([5014][gh5014])
• Correctly set scheme in coreapi TokenAuthentication. ([5000][gh5000], [4994][gh4994])
• HEAD requests on ViewSets should not return 405. ([4705][gh4705], [4973][gh4973], [4864][gh4864])
• Support usage of 'source' in extra_kwargs. ([4688][gh4688])
• Fix invalid content type for schema.js ([4968][gh4968])
• Fix DjangoFilterBackend inheritance issues. ([5089][gh5089], [5117][gh5117])

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[agconti]

Closes for release #327