Renaming v4.0.x git branch

[Chaigneau, Nicolas]

But isn't "master" even better than 4 ? 😃

(the default branch on GitHub is master - and was 4.0.x before that, maybe that's why people are using it ?)


Note: links in the README.md are now broken (they still point to 4.0.x).


>   We've renamed the v4.0.x branch to "master".  This is in part due to the problem that random people are installing v4 (because 4>3), and then trying to use it.
> 
>   You can fix up your local repos by doing:
> 
> git branch -m v4.0.x master
> git branch --set-upstream-to origin/master
> 
>   Alan DeKok.
>
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