gbp clone, upstream-branch is not 'upstream' but `release`

[Tong Sun]

Hi,

I did a

gbp clone -v https://github.com/neurobin/shc.git

from scratch, but found that my branches are:

$ git branch -v
* master  556fd7a release after fix #38
  release 379c501 release after fix #38

See? the upstream-branch is not 'upstream' but called `release` instead.
Why?
Shouldn't the upstream branch default to be 'upstream'?

    --upstream-branch=UPSTREAM_BRANCH
                        Upstream branch, default is 'upstream'

thx