Remove obsolete branch alias
Remove obsolete branch alias

dhensby/silverstripe-gridfieldextensions,silverstripe-australia/silverstripe-gridfieldextensions,symbiote/silverstripe-gridfieldextensions,silverstripe-australia/silverstripe-gridfieldextensions,kinglozzer/silverstripe-gridfieldextensions,dhensby/silverstripe-gridfieldextensions,symbiote/silverstripe-gridfieldextensions,kinglozzer/silverstripe-gridfieldextensions