update check disk due to the bug in wmic

[jasiek191]

https://stackoverflow.com/questions/9673057/wmic-error-invalid-xsl-format-in-windows7

Pull Request Checklist

Is this in reference to an existing issue?

General

• [ ] Update Changelog following the conventions laid out on Our CHANGELOG Guidelines

• [ ] Update README with any necessary configuration snippets

• [ ] Binstubs are created if needed

• [ ] RuboCop passes

• [ ] Existing tests pass

New Plugins

• [ ] Tests

• [ ] Add the plugin to the README

• [ ] Does it have a complete header as outlined here

Purpose

Known Compatibility Issues

[majormoses]

@jasiek191 sorry about the noise...appveyor is being a PITA and I am not really a windows person. If it does not pass on appveyor again I will just merge and release it. Afterwards I will try to go back in and figure out what magic combination of stuff will start working.

[majormoses]

released: https://rubygems.org/gems/sensu-plugins-windows/versions/2.9.1