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

## The devDependency [@types/jest](https://github.com/DefinitelyTyped/DefinitelyTyped) was updated from `23.3.5` to `23.3.6`.

🚨 [View failing branch](https://github.com/alexjoverm/typescript-library-starter/compare/master...alexjoverm:greenkeeper%2F%40types%2Fjest-23.3.6).

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

@types/jest 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/alexjoverm/typescript-library-starter/builds/439843285?utm_source=github_status&utm_medium=notification)).

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