Auto patch ssl for Python 3.7-

[hellysmile]

Long story short

Proposal to fix #949

There is an idea discussed with @asvetlov offline: automatically patch Python runtime by https://github.com/aio-libs/idna_ssl if Python version is lower then 3.7

Expected behaviour

ssl.CertificateError works correct for idna hosts

Actual behaviour

ssl.CertificateError is raised

Steps to reproduce

import asyncio

import aiohttp

URL = 'https://цфоут.мвд.рф/news/item/8065038/'


async def main():
    async with aiohttp.ClientSession() as session:
        async with session.get(URL) as response:
            print(response)


loop = asyncio.get_event_loop()
loop.run_until_complete(main())

Your environment

aiohttp server master
Python 3.6.2

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new