Update resolve-from to the latest version 🚀 (#4031)

## The dependency [resolve-from](https://github.com/sindresorhus/resolve-from) was updated from `4.0.0` to `5.0.0`.
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.

---

<details>
<summary>Release Notes for v5.0.0</summary>

<p>Breaking:</p>
<ul>
<li>Require Node.js 8 (<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="432880928" data-permission-text="Issue title is private" data-url="sindresorhus/resolve-from#12" data-hovercard-type="pull_request" data-hovercard-url="/sindresorhus/resolve-from/pull/12/hovercard" href="https://urls.greenkeeper.io/sindresorhus/resolve-from/pull/12">#12</a>)  <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/sindresorhus/resolve-from/commit/188ed7da119c788d98272852e8a71fd19195f6cf/hovercard" href="https://urls.greenkeeper.io/sindresorhus/resolve-from/commit/188ed7da119c788d98272852e8a71fd19195f6cf"><tt>188ed7d</tt></a></li>
<li>Return <code>undefined</code> instead of <code>null</code> when the module cannot be found (<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="432880928" data-permission-text="Issue title is private" data-url="sindresorhus/resolve-from#12" data-hovercard-type="pull_request" data-hovercard-url="/sindresorhus/resolve-from/pull/12/hovercard" href="https://urls.greenkeeper.io/sindresorhus/resolve-from/pull/12">#12</a>)  <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/sindresorhus/resolve-from/commit/188ed7da119c788d98272852e8a71fd19195f6cf/hovercard" href="https://urls.greenkeeper.io/sindresorhus/resolve-from/commit/188ed7da119c788d98272852e8a71fd19195f6cf"><tt>188ed7d</tt></a></li>
</ul>
<p>Enhancements:</p>
<ul>
<li>Add TypeScript definition (<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="432880928" data-permission-text="Issue title is private" data-url="sindresorhus/resolve-from#12" data-hovercard-type="pull_request" data-hovercard-url="/sindresorhus/resolve-from/pull/12/hovercard" href="https://urls.greenkeeper.io/sindresorhus/resolve-from/pull/12">#12</a>)  <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/sindresorhus/resolve-from/commit/188ed7da119c788d98272852e8a71fd19195f6cf/hovercard" href="https://urls.greenkeeper.io/sindresorhus/resolve-from/commit/188ed7da119c788d98272852e8a71fd19195f6cf"><tt>188ed7d</tt></a></li>
</ul>
<p><a class="commit-link" href="https://urls.greenkeeper.io/sindresorhus/resolve-from/compare/v4.0.0...v5.0.0"><tt>v4.0.0...v5.0.0</tt></a></p>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 2 commits.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/sindresorhus/resolve-from/commit/53f4a1b40f972dbfc4dda9627d24068000eae897"><code>53f4a1b</code></a> <code>5.0.0</code></li>
<li><a href="https://urls.greenkeeper.io/sindresorhus/resolve-from/commit/188ed7da119c788d98272852e8a71fd19195f6cf"><code>188ed7d</code></a> <code>Require Node.js 8, return <code>undefined</code> instead of <code>null</code>, add TypeScript definition (#12)</code></li>
</ul>
<p>See the <a href="https://urls.greenkeeper.io/sindresorhus/resolve-from/compare/60cd04e69135b96b98b848fff719b1276a5610c0...53f4a1b40f972dbfc4dda9627d24068000eae897">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

@@ -77,7 +77,7 @@
     "postcss-selector-parser": "^3.1.0",
     "postcss-syntax": "^0.36.2",
     "postcss-value-parser": "^3.3.1",
-    "resolve-from": "^4.0.0",
+    "resolve-from": "^5.0.0",
     "signal-exit": "^3.0.2",
     "slash": "^2.0.0",
     "specificity": "^0.4.1",