An in-range update of @types/qunit is breaking the build 🚨

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## The devDependency [@types/qunit](https://github.com/DefinitelyTyped/DefinitelyTyped) was updated from `2.9.0` to `2.9.1`.

🚨 [View failing branch](https://github.com/ember-fastboot/simple-dom/compare/master...ember-fastboot:greenkeeper%2F%40types%2Fqunit-2.9.1).

This version is **covered** by your **current version range** and after updating it in your project **the build failed**.

@types/qunit is a devDependency of this project. It **might not break your production code or affect downstream projects**, but probably breaks your build or test tools, which may **prevent deploying or publishing**.

Status Details

- ❌ **continuous-integration/travis-ci/push:** The Travis CI build could not complete due to an error ([Details](https://travis-ci.org/github/ember-fastboot/simple-dom/builds/669817672?utm_source=github_status&utm_medium=notification)).

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