Replace the _stop method, which was removed from aiosmtp 1.4.3, with the cancel_tasks method

[henri-hulski]

Fixes #53 .

[diazona]

Thanks! So this looks fine; I'd just like to get the tests on Python <3.7 working before I merge. (Or, if it's too much effort, we can just drop compatibility with those old versions of Python.) I'll work on fixing the tests today or tomorrow.

[henri-hulski]

Ok. It seems quite difficult to maintain Python < 3.7. Github Actions doesn't seem to support it.
So I think it's fine to drop it.

[diazona]

It's not difficult, we just have to use an older version of Ubuntu. I made that fix in #56.

Anyway, it looks like these two pull requests need each other in order to get all the tests passing: yours fixes the tests on Python 3.7 and up, while mine fixes the tests on Python 3.6 and lower. So I'll probably just merge them both and hope that all the tests pass on master when it's done. But I would like to do it tomorrow because it's 2:30 AM for me right now 😄 (my personal rule of thumb: always wait a day before merging a PR, it helps catch stupid mistakes). Then perhaps I'll make a prerelease version early next week and you can test it, to be followed by a final release later in the week.

[diazona]

Hooray it works 😄

I uploaded a prerelease version (v0.7.1a0) to PyPI to get this fix published for people who need it. If you can, give it a try and if you still have any problems, create a new issue. If no other problems come up, I'll aim to make a final release with this bug fix later this coming week.

[henri-hulski]

Great! 🎉
I will try it out.
If I gonna have any problems I tell you.
Actually already changed it in the venv and so far everything works fine.