Aiohttp-json-api

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* Fix bug with no Accept header in request

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* Improve content type negotiation
* Improve documentation
* Add field for Date
* Add example based on `fantasy database <https://github.com/endpoints/fantasy-database>`_
* Introduce JSON API integration test suite (not done yet!)
* Improve collections helpers
* No more links normalization by default
* Move meta object at top level of result document

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* Constants, enums and structs refactoring *(backward incompatible)*
* Add useful typings
* Documentation fixes
* Extend development requirements

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* Improve performance of URL resolving again. At this time with usage of standard Python urllib
* Upgrade requirements

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* Improve performance of URL resolving in Link field (with `cachetools`_)
* Upgrade requirements

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* Documentation improvements