An in-range update of uglify-js is breaking the build 🚨

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## The devDependency [uglify-js](https://github.com/mishoo/UglifyJS) was updated from `3.9.2` to `3.9.3`.

🚨 [View failing branch](https://github.com/WebReflection/regular-elements/compare/master...WebReflection:greenkeeper%2Fuglify-js-3.9.3).

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




uglify-js 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>

- ❌ **Travis CI - Branch:** <a href='https://travis-ci.com/github/WebReflection/regular-elements/builds/165700961'><img src='https://travis-ci.com/images/stroke-icons/icon-errored.png' height='11'> The build</a> **errored**. 
</details>


---

<details>
<summary>Release Notes for v3.9.3</summary>

 
</details>

<details>
<summary>Commits</summary>
The new version differs by 35 commits.
<ul>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/30ed8f558038ea1017ecd8cb4a02851eaed92ac0"><code>30ed8f5</code></a> <code>v3.9.3</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/dc9e7cd1fef385477332e13a0a384f465e81a2fb"><code>dc9e7cd</code></a> <code>suppress <code>ufuzz</code> false positives (#3893)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/76f40e25285e017d95780dac61e1f8fef395e8c2"><code>76f40e2</code></a> <code>fix corner case in <code>collapse_vars</code> (#3892)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/8024f7f7a86023cf68f1f1b2496ec38c8bc200d8"><code>8024f7f</code></a> <code>fix corner case in <code>ie8</code> (#3890)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/eb7fa252703c052f81e2ab491d84ba352648e4c9"><code>eb7fa25</code></a> <code>fix corner case in <code>evaluate</code> (#3888)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/ee7647dc676b18355286609e9a4404dbcdcecc90"><code>ee7647d</code></a> <code>fix corner case in <code>collapse_vars</code> (#3885)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/bd2f53bc8b505ff5bba4e899ea4886d856128b39"><code>bd2f53b</code></a> <code>fix corner case in <code>evaluate</code> (#3883)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/e8a7956b6f0a71bed038a2b8936eb30d91e94d73"><code>e8a7956</code></a> <code>fix corner case in <code>reduce_vars</code> (#3881)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/2b24dc25fbe78d25b41b2e48bc38fedc6965d572"><code>2b24dc2</code></a> <code>fix corner cases in <code>evaluate</code> &amp; <code>reduce_vars</code> (#3879)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/35cc5aa06fd05437b6fa538ca3f32a876156d4da"><code>35cc5aa</code></a> <code>extend <code>--reduce-test</code> to cover <code>minify()</code> bugs (#3876)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/c1dd49e07550c3c4599dab6570ff8291f5722b59"><code>c1dd49e</code></a> <code>fix corner case in <code>comparisons</code> (#3877)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/c76ee4b868f2b2cdf87e7ab4a000997c475bdbf3"><code>c76ee4b</code></a> <code>enhance <code>if_return</code> (#3875)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/e23bf480522e64db43f8764fef64312750c58e77"><code>e23bf48</code></a> <code>enhance <code>evaluate</code> &amp; <code>reduce_vars</code> (#3873)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/7e0ad232b079202024ea845a2076ee78e1e0dbd7"><code>7e0ad23</code></a> <code>retain <code>@__PURE__</code> call when return value is used (#3874)</code></li>
<li><a href="https://urls.greenkeeper.io/mishoo/UglifyJS/commit/63adfb1590886b9b03827805e1226bfe235e5868"><code>63adfb1</code></a> <code>fix corner case in <code>hoist_props</code> (#3872)</code></li>
</ul>
There are 35 commits in total.
See the <a href="https://urls.greenkeeper.io/mishoo/UglifyJS/compare/20f9a1d9089dca38456c8da8dcf110915967a82e...30ed8f558038ea1017ecd8cb4a02851eaed92ac0">full diff</a>
</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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Uh oh!

An in-range update of uglify-js is breaking the build 🚨 #27

The devDependency uglify-js was updated from `3.9.2` to `3.9.3`.

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An in-range update of uglify-js is breaking the build 🚨 #27

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The devDependency uglify-js was updated from 3.9.2 to 3.9.3.

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The devDependency uglify-js was updated from `3.9.2` to `3.9.3`.