RFR: Refactor notifier bot constructors

[Erik Helin]

On Mon, 17 Feb 2020 10:31:20 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

> Hi all,
> 
> Please review this refactoring change that changes a few multi-argument-constructors into builders instead.
> 
> Best regards,
> Robin

Looks good

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Marked as reviewed by ehelin (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/440