FYI: notify: rename JsonUpdater to JsonNotifier

[Robin Westberg]

On Wed, 10 Jun 2020 08:32:02 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this small refactoring that renames `JsonUpdater` to `JsonNotifier`.
> 
> Testing:
> - `make test` passes on Linux x64
> 
> Thanks,
> Erik

Looks good! We could also consider deleting this notifier as there are no consumers of the output, but it doesn't hurt
anything either..

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Marked as reviewed by rwestberg (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/647