fix 404 in readme link

[returnDanilo]

Description

The url seems to be missing a /latest.

Also, I suggest:

• creating a 2.x version on readthedocs and making stable point to it.
• make the default readthedocs version point to stable.
• when v3 becomes stable: create a 3.x readthedocs version and point stable to it instead.
• when v3 becomes stable: update the readme to have doc links point to stable. (they currently point to latest)

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
  • I have updated the changelog with a quick recap of my changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)
• I have read and agree to the Developer Certificate of Origin for this contribution

[EvieePy]

Hey thanks for the PR.

I have pointed the documentation to latest as we want to encourage people to move to this release. Starting on version 2 wouldn't be advisable at this point as it is not actively maintained and quite outdated, missing many features and breaks on modern python asyncio under certain circumstances without applying fixes.

Maintaining a build for version 2 is definitely something I will add, and I'll likely add a link to them on the readme and index of the new docs.