Fix contributing guide links #1395

[RobPDev]

I also converted the links to HTTPS and as the .org resolved to .io I changed the README to point to .io.

[RobPDev]

I've tried running the failing test locally, using python 3.8 it passes if types-setuptools is installed.

[drvinceknight]

Thanks for this, your fixes certainly shouldn't affect the type hints so I'm guessing this might be due to an update of mypy (?). Could you add types-setuptools to this line of the workflow config: https://github.com/Axelrod-Python/Axelrod/blob/dev/.github/workflows/config.yml#L48 to check if that fixes things?

[RobPDev]

I've done a bit of testing, mypy==0.812 passes, mypy==0.900 requires types-setuptools.

mypy 0.900 removed library stubs.

[drvinceknight]

This looks like it's sorted the problem. Thanks @RobPDev 👍

[RobPDev]

Just noticed this PR hasn't linked to the issue.
Fixes #1395