Docs point to master's (1.0.0a0) release intead of a stable release (0.12.3)

[th3coop]

A coworker and I just had a bit of confusion with the aiocache code. We were referencing the latest docs, naively assuming that it was for 0.12.3, but nothing was matching up with the actual module code. We finally realized that the "latest" docs actually point to an alpha release, 1.0.0.a0, which appears to significant compabilities issues with earlier releases.
https://aiocache.aio-libs.org/en/latest/:

That was really confusing. We're also not able to select 0.12.3 as a version so we're just going with 0.12.2 for docs. Maybe "stable" is 0.12.3 but I can't tell as the version is missing from the page when I select "stable":

Not sure if this all was intentional but it sent us for a wild goose chase. If it was intentional, I'd re-think it. The default docs that load shouldn't be unreleased code.

[Dreamsorcerer]

Can probably look at adding a version to the docs somewhere, but latest always means master, that's just how RTD works.

[Dreamsorcerer]

We can also change the default, as it appears to default to latest, which is not what we want.

[Dreamsorcerer]

@asvetlov Have you got access to this one on RTD?

[Dreamsorcerer]

Or @argaen?

[th3coop]

We can also change the default, as it appears to default to latest, which is not what we want.

yeah, I probably could have made that point more clear. This is all I'm suggesting to do here really.