support aiohttp and sanic for python 3.6

[antonio-antuan]

Looks like aiohttp and sanic integrations python 3.6 can be supported, because of backported contextvars library

[untitaker]

afaik the issue was that this contextvars backport doesn't work with asyncio from the stdlib at all (leaking context all over the place).

We have leak tests in the sanic test suite, so if the testsuite works with that backport this would be interesting to investigate again

[antonio-antuan]

Unfortunatelly, you are right :(
Here is an issue about asyncio support.

[untitaker]

Just curious, is something holding you on Python 3.6? Distro packages?

[antonio-antuan]

Sure :)
To upgrade from 3.6 to 3.7 we need to change aiohttp, aiopg versions: currently one of them uses async as argument. After upgrading library version, we need change another one, because API changed... A half year ago I tried to do it, but problems apeared like a snowball... Going to make another try :)