[CVE-2017-17042] update vulnerable `yard` dependency

[majormoses]

Signed-off-by: Ben Abrams me@benabrams.it

Pull Request Checklist

https://github.com/sensu-plugins/community/issues/97

General

• [ ] Update Changelog following the conventions laid out here

• [ ] Update README with any necessary configuration snippets

• [ ] Binstubs are created if needed

• [ ] RuboCop passes

• [ ] Existing tests pass

Purpose

Address CVE, see parent issue for details

Known Compatibility Issues

none

[majormoses]

released: https://rubygems.org/gems/sensu-plugins-disk-checks/versions/3.0.1

[majormoses]

Down with the CVE's!

Just as long as I don't have to get down with the sickness as well, had my fill for a while.