Update find-cache-dir in group default to the latest version 🚀 (#41)
Update find-cache-dir in group default to the latest version 🚀 (#41)

## The dependency [find-cache-dir](https://github.com/avajs/find-cache-dir) was updated from `2.1.0` to `3.0.0`.
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 v3.0.0</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="429988266" data-permission-text="Issue title is private" data-url="https://github.com/avajs/find-cache-dir/issues/15" data-hovercard-type="pull_request" data-hovercard-url="/avajs/find-cache-dir/pull/15/hovercard" href="https://urls.greenkeeper.io/avajs/find-cache-dir/pull/15">#15</a>)  <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/avajs/find-cache-dir/commit/a0ed7cce14124e26818b238bc844441572b4f8dd/hovercard" href="https://urls.greenkeeper.io/avajs/find-cache-dir/commit/a0ed7cce14124e26818b238bc844441572b4f8dd"><tt>a0ed7cc</tt></a></li>
<li>Return <code>undefined</code> instead of <code>null</code> if the cache directory cannot be found (<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="429988266" data-permission-text="Issue title is private" data-url="https://github.com/avajs/find-cache-dir/issues/15" data-hovercard-type="pull_request" data-hovercard-url="/avajs/find-cache-dir/pull/15/hovercard" href="https://urls.greenkeeper.io/avajs/find-cache-dir/pull/15">#15</a>)  <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/avajs/find-cache-dir/commit/a0ed7cce14124e26818b238bc844441572b4f8dd/hovercard" href="https://urls.greenkeeper.io/avajs/find-cache-dir/commit/a0ed7cce14124e26818b238bc844441572b4f8dd"><tt>a0ed7cc</tt></a></li>
</ul>
<p>Enhancements:</p>
<ul>
<li>Update dependencies (<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="429988266" data-permission-text="Issue title is private" data-url="https://github.com/avajs/find-cache-dir/issues/15" data-hovercard-type="pull_request" data-hovercard-url="/avajs/find-cache-dir/pull/15/hovercard" href="https://urls.greenkeeper.io/avajs/find-cache-dir/pull/15">#15</a>)  <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/avajs/find-cache-dir/commit/a0ed7cce14124e26818b238bc844441572b4f8dd/hovercard" href="https://urls.greenkeeper.io/avajs/find-cache-dir/commit/a0ed7cce14124e26818b238bc844441572b4f8dd"><tt>a0ed7cc</tt></a></li>
</ul>
<p><a class="commit-link" href="https://urls.greenkeeper.io/avajs/find-cache-dir/compare/v2.1.0...v3.0.0"><tt>v2.1.0...v3.0.0</tt></a></p>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 3 commits.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/avajs/find-cache-dir/commit/f6ecb85f6137107a048083afde1f064033c10a50"><code>f6ecb85</code></a> <code>3.0.0</code></li>
<li><a href="https://urls.greenkeeper.io/avajs/find-cache-dir/commit/a0ed7cce14124e26818b238bc844441572b4f8dd"><code>a0ed7cc</code></a> <code>Update dependencies, require Node.js 8 (#15)</code></li>
<li><a href="https://urls.greenkeeper.io/avajs/find-cache-dir/commit/1f96b9854ca75871076229c89730cda4dfb2aed6"><code>1f96b98</code></a> <code>Add Tidelift mention in the readme</code></li>
</ul>
<p>See the <a href="https://urls.greenkeeper.io/avajs/find-cache-dir/compare/bfcdbd855fdc860e037e6739eb1cccedbed4b893...f6ecb85f6137107a048083afde1f064033c10a50">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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