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New functionality and features
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* Add `srcset` to `CloudinaryResource.image`
* Add support of "auto" value for `start_offset` transformation parameter
* Add language and platform version to user_agent / platform_agent
Other Changes
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* Fix `test12_transformations` unit test
* Fix case when resource has no width and height
* Update `README`, add `Configuration` subtitle under `Django`
* django setup: need to add cloudinary to installed_apps in settings.py (152)
* Fix raw transformation parameter extra comma
* Fix `test_raw_conversion` unit test