RFR: git-pr: support git pr create --draft

[Robin Westberg]

On Tue, 18 Feb 2020 15:07:40 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch adds support for `--draft` switch to `git pr create`.
> 
> Testing:
> - Manual testing of `git pr create`
> 
> Thanks,
> Erik

Looks good!

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Marked as reviewed by rwestberg (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/454