move to github

[zjh]

>If I pull request to https://github.com/saschahauer/barebox,
>it will merge to https://git.pengutronix.de/cgit/barebox?


On Thu, Sep 14, 2017 at 12:52:32PM +0300, Alexander Shiyan wrote:
> Hello.
> 
> >Четверг, 14 сентября 2017, 12:48 +03:00 от zjh <jianhuizhao.329 at gmail.com>:
> >
> >I suggest that Barebox migrate to GitHub, which makes it easier to develop.
> 
> https://github.com/saschahauer/barebox
> 
> ---