Update mocha to the latest version 🚀 (#38)

## The devDependency [mocha](https://github.com/mochajs/mocha) was updated from `6.0.1` to `6.0.2`.
This version is **not covered** by your **current version range**.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

---

<details>
<summary>Release Notes for v6.0.2</summary>

<h1>6.0.2 / 2019-02-25</h1>
<h2><g-emoji class="g-emoji" alias="bug" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f41b.png">🐛</g-emoji> Fixes</h2>
<p>Two more regressions fixed:</p>
<ul>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/issues/3768" data-hovercard-type="pull_request" data-hovercard-url="/mochajs/mocha/pull/3768/hovercard">#3768</a>: Test file paths no longer dropped from <code>mocha.opts</code> (<a href="https://urls.greenkeeper.io/boneskull"><strong>@boneskull</strong></a>)</li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/issues/3767" data-hovercard-type="pull_request" data-hovercard-url="/mochajs/mocha/pull/3767/hovercard">#3767</a>: <code>--require</code> does not break on module names that look like certain <code>node</code> flags (<a href="https://urls.greenkeeper.io/boneskull"><strong>@boneskull</strong></a>)</li>
</ul>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 6 commits.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/00a895f6ad9c1e4c5500851d6ff875e8254a5e06"><code>00a895f</code></a> <code>Release v6.0.2</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/1edce76eb88c2c04dee604efc10552b0a7d5e637"><code>1edce76</code></a> <code>update CHANGELOG for v6.0.2 [ci skip]</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/347e9db3b40eb22bcbc23a026d9915c77040b897"><code>347e9db</code></a> <code>fix broken positional arguments in config; ensure positional args are unique; closes #3763</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/9e31e9dcfd45b958aa14961f35abbff8f7ea2b1b"><code>9e31e9d</code></a> <code>fix handling of bareword args matching node flags; closes #3761</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/6535965e8655a66de54fc0ad9465c2eb825f13f8"><code>6535965</code></a> <code>Update "karma-browserify" to eliminate Karma middleware warning (#3762)</code></li>
<li><a href="https://urls.greenkeeper.io/mochajs/mocha/commit/37febb62796374114d2e24534eb44f8776bc7800"><code>37febb6</code></a> <code>improve issue template. (#3411)</code></li>
</ul>
<p>See the <a href="https://urls.greenkeeper.io/mochajs/mocha/compare/6d3d6b4d5262f9d6374a887834224eb729890b4d...00a895f6ad9c1e4c5500851d6ff875e8254a5e06">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>

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package.json

@@ -31,7 +31,7 @@
     "@types/node": "^10.5.6",
     "expect": "^23.4.0",
     "husky": "0.14.3",
-    "mocha": "6.0.1",
+    "mocha": "6.0.2",
     "tslint": "5.12.1",
     "typescript": "3.3.3"
   },