An in-range update of mocha is breaking the build 🚨

## The devDependency [mocha](https://github.com/mochajs/mocha) was updated from `6.2.0` to `6.2.1`.

🚨 [View failing branch](https://github.com/istanbuljs/babel-plugin-istanbul/compare/master...istanbuljs:greenkeeper%2Fmocha-6.2.1).

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




mocha 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**.



<details>
<summary>Status Details</summary>

- ✅ **Tidelift:** Dependencies checked ([Details](https://tidelift.com/scans/24740fc8-cb89-4d05-9b67-48bb4368a30f)).
- ❌ **continuous-integration/travis-ci/push:** The Travis CI build failed ([Details](https://travis-ci.org/istanbuljs/babel-plugin-istanbul/builds/591122104?utm_source=github_status&utm_medium=notification)).
- ✅ **coverage/coveralls:** First build on greenkeeper/mocha-6.2.1 at 97.222% ([Details](https://coveralls.io/builds/25998851)).
</details>


---

<details>
<summary>Commits</summary>
<p>The new version differs by 11 commits.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/ef6c820262708b302c07ea12b130a9e4dc8b4964"><code>ef6c820</code></a> <code>Release v6.2.1</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/952497836df20bef88ee546951e3c72fc1466f08"><code>9524978</code></a> <code>updated CHANGELOG for v6.2.1 [ci skip]</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/dfdb8b38ab8911b7a94d1d7c4d0a60c8f44bd705"><code>dfdb8b3</code></a> <code>Update yargs to v13.3.0 (#3986)</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/18ad1c187ab0bc4ea12ef929db2ee0679a22b63c"><code>18ad1c1</code></a> <code>treat '--require esm' as Node option (#3983)</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/fcffd5a6a982aae56ae0585f33939ae4d1638631"><code>fcffd5a</code></a> <code>Update yargs-unparser to v1.6.0 (#3984)</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/ad4860e0aa2d3fea0e544edc784dc1140e2115a9"><code>ad4860e</code></a> <code>Remove extraGlobals() (#3970)</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/b269ad01b8faedc21d0bc0a955495719a06bae9d"><code>b269ad0</code></a> <code>Clarify effect of .skip() (#3947)</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/1e6cf3b74af087dd8c4c79804c7206a0bb589404"><code>1e6cf3b</code></a> <code>Add Matomo to website (#3765)</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/91b3a547b9bce571bf3f98417691d38658c6d576"><code>91b3a54</code></a> <code>fix style on mochajs.org (#3886)</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/0e9d8ad59a78a482d97f4fe735dafa1f65dc89d2"><code>0e9d8ad</code></a> <code>tty.getWindowSize is not a function inside a "worker_threads" worker (#3955)</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/48da42e6ad59827242b4671b4d34a9c69b91e0cf"><code>48da42e</code></a> <code>Remove jsdoc index.html placeholder from eleventy file structure and fix broken link in jsdoc tutorial (#3966)</code></li>
</ul>
<p>See the <a href="https://urls.greenkeeper.io/mochajs/mocha/compare/bd477769d6d76f467363ef2ff27e0b622aa5a132...ef6c820262708b302c07ea12b130a9e4dc8b4964">full diff</a></p>
</details>


<details>
<summary>FAQ and help</summary>

There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).
</details>

---


Your [Greenkeeper](https://greenkeeper.io) Bot :palm_tree:

[]