Merge #3892

3892: Update cross-env to the latest version 🚀 r=jniles a=greenkeeper[bot]


## The dependency [cross-env](https://github.com/kentcdodds/cross-env) was updated from `5.2.1` to `6.0.0`.
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.

---

**Publisher:** [kentcdodds](https://www.npmjs.com/~kentcdodds)
**License:** MIT

<details>
<summary>Release Notes for v6.0.0</summary>

<p><a name="user-content-6.0.0"></a></p>
<h1><a href="https://urls.greenkeeper.io/kentcdodds/cross-env/compare/v5.2.1...v6.0.0">6.0.0</a> (2019-09-17)</h1>
<h3>Bug Fixes</h3>
<ul>
<li>bumped cross-spawn to version 7.0.0 (<a href="https://urls.greenkeeper.io/kentcdodds/cross-env/issues/211" data-hovercard-type="pull_request" data-hovercard-url="/kentcdodds/cross-env/pull/211/hovercard">#211</a>) (<a href="https://urls.greenkeeper.io/kentcdodds/cross-env/commit/61ebf59">61ebf59</a>)</li>
</ul>
<h3>BREAKING CHANGES</h3>
<ul>
<li>Drop support for Node.js &lt; 7.</li>
</ul>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 1 commits.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/kentcdodds/cross-env/commit/61ebf5970e88e915a09e80d0858ca6344efaa3ae"><code>61ebf59</code></a> <code>fix: bumped cross-spawn to version 7.0.0 (#211)</code></li>
</ul>
<p>See the <a href="https://urls.greenkeeper.io/kentcdodds/cross-env/compare/a75fd0ef17b94f002166f894c357a1dee02cc97e...61ebf5970e88e915a09e80d0858ca6344efaa3ae">full diff</a></p>
</details>

---

<details>
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</details>

---


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package.json

@@ -67,7 +67,7 @@
     "connect-redis": "^3.4.0",
     "cron": "^1.7.1",
     "cropper": "^4.0.0",
-    "cross-env": "^5.2.0",
+    "cross-env": "^6.0.0",
     "csvtojson": "^2.0.8",
     "debug": "^4.1.1",
     "dotenv": "^8.0.0",