Update connexion to 2.1.0

[pyup-bot]

This PR updates connexion[swagger-ui] from 2.0.2 to 2.1.0.

Changelog

2.1.0

- 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)

Links

• PyPI: https://pypi.org/project/connexion
• Changelog: https://pyup.io/changelogs/connexion/
• Repo: https://github.com/zalando/connexion

[coveralls]

Pull Request Test Coverage Report for Build 127

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.855%

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Totals
Change from base Build 114:	0.0%
Covered Lines:	406
Relevant Lines:	442

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💛 - Coveralls