[pt-br]Remove promotion

Important, if going to be merged, going after #96.

@walkeralencar, do you think it's ok to remove this part of translation?

My point it that none of the other translations (es, it, fr etc.) are informing the credits of translators at all.

I think the contributors/credits, in case of any need, could be get via git commit log (or GitHub contributors https://github.com/mojombo/semver.org/graphs/contributors), couldn't?