RFR: Post the incremental webrev url in the PR comment

[Erik Helin]

On Mon, 20 Jan 2020 14:14:05 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

> Hi all,
> 
> Please review this change that fixes a regression where the link to the incremental webrev wasn't posted in the PR status comment.
> 
> Best regards,
> Robin

Looks good, thanks!

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Marked as reviewed by ehelin (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/367