Fix godoc links at top of README

[dsymonds]

They were pointing at v1 whereas the rest of the doc points at v2.

[vmarkovtsev]

Thanks!

Could you please add the signed-off-by (DCO check).

[dsymonds]

I hereby disclaim any copyright interest in this change, and assign it to the project.

[vmarkovtsev]

Thanks again. This is OK from the legal point of view and I can merge this right now, but let me ask first if it is possible to execute

git commit --amend --no-edit --signoff
git push -f origin patch-1

I see that you used the GitHub web UI to create the fix, so I guess it will be a pain. At the same time, when we will do license audit in the future, we will see that all the external contributions are signed-off without having to go to this specific PR page.

[dsymonds]

Yeah, understand. A bit annoying, but done.