RFR: forge: use commit object in GitHubRepository.commitMetadata

[Robin Westberg]

On Fri, 12 Jun 2020 14:11:53 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that properly parses the JSON reply from the `/commits` endpoint on GitHub.
> 
> Testing:
> - [ ] None, but this time I'm sure I got it right ��
> 
> Thanks,
> Erik

Must surely work!

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Marked as reviewed by rwestberg (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/661