Aio-request

* Return default json expected content_type to "application/json"
* [Release aiohttp response instead of close](https://github.com/Pliner/aio-request/pull/108)
* [Validate json content-type](https://github.com/Pliner/aio-request/pull/109)

* Content type should be None in Response.json()

* [Do not expect json content type by default](https://github.com/Pliner/aio-request/pull/106)

* [Support async-timeout 4.0+](https://github.com/Pliner/aio-request/pull/86)

* [Reexport explicitly](https://github.com/Pliner/aio-request/pull/74)

* [Fix patch/patch_json visibility](https://github.com/Pliner/aio-request/pull/73)