prep for 1.4.0 release

[majormoses]

Pull Request Checklist

• 132

• 129

General

• [ ] Update Changelog following the conventions laid out here

• [ ] Update README with any necessary configuration snippets

• [ ] Cookstyle (rubocop) passes

• [ ] Rspec (unit tests) passes

• [ ] Inspec (integration tests) passes

Purpose

Release a new version with additional functionality

Known Compatibility Issues

None

[majormoses]

These links will be valid once we tag the new release

[majormoses]

Released:

• https://github.com/sensu/sensu-go-chef/releases/tag/1.4.0
• https://supermarket.chef.io/cookbooks/sensu-go/versions/1.4.0