Connexion

* Require Python 3.6 for pip installation (1108)

* Drop Python 2.7 support, support Python 3.8
* Convert responses to raise `ProblemException` (955)
* Add error path to schema validation
* Do not sanitize body keys in OpenAPI 3 (1008)
* Date/time serialization (851)
* Forward options to AioHTTP app (885)
* Returning tuples supported in AioHTTP (849)
* Allow Swagger UI configuration options (948)
* Remove security parameter to pass query validation (470)
* Allow users to enable debug mode via environment variable

* Handle deepObject and explode: true (971)
* Support jsonschema > 3.0.0 (1050)
* Drop Python 3.4 and 3.5. Add Python 3.8 (1056)
* Fix deprecated import (1044)
* Bump Flask version (995)

- AioHttpApi oauth middleware catches all OAuth problems (830)
- Serve YAML spec (842)
- Added MethodViewResolver (847)
- Fix swagger console backslash redirect for aiohttp (843)
- Fix uwsgi metric collection (972)
- Respond with problems by default in aiohttp (952)

- Fix case sensitive headers in aiohttp (825)
- Fix passing empty object body (815)
- Fix openapi3 path and query validation (821)
- Add path to API only for HTTP operations (817)
- Added OpenAPI 3 getting API Key from cookie support (794)

- Proper debug logs for aiohttp's StreamResponse (787)
- Fix cli --stub (800)
- Fix handling additionalProperties in body (789)
- Change can_read_body to body_exists in AioHttpApi.get_request (738)
- Removed duplicated calls of get_response method of the Api classes (809)
- Fix up array style defaults (803)