Update copy-webpack-plugin to the latest version 🚀 (#33)

## The devDependency [copy-webpack-plugin](https://github.com/webpack-contrib/copy-webpack-plugin) was updated from `4.6.0` 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><a name="user-content-5.0.0"></a></p>
<h1><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/compare/v4.6.0...v5.0.0">5.0.0</a> (2019-02-20)</h1>
<h3>Bug Fixes</h3>
<ul>
<li>copy only modified files when you use patterns with difference <code>to</code> and same <code>context</code> (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/issues/341" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/copy-webpack-plugin/pull/341/hovercard">#341</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/e808aa2">e808aa2</a>)</li>
<li>handle <code>[contenthash]</code> as template (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/issues/328" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/copy-webpack-plugin/pull/328/hovercard">#328</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/61dfe52">61dfe52</a>)</li>
<li>handles when you add new files in watch mode and use <code>glob</code> (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/issues/333" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/copy-webpack-plugin/pull/333/hovercard">#333</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/49a28f0">49a28f0</a>)</li>
<li>normalize path segment separation, no problems when you mixed <code>/</code> and <code>\\</code> (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/issues/339" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/copy-webpack-plugin/pull/339/hovercard">#339</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/8f5e638">8f5e638</a>)</li>
<li>throw error if <code>from</code> is an empty string <a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/issues/278" data-hovercard-type="issue" data-hovercard-url="/webpack-contrib/copy-webpack-plugin/issues/278/hovercard">#278</a> (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/issues/285" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/copy-webpack-plugin/pull/285/hovercard">#285</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/adf1046">adf1046</a>)</li>
</ul>
<h3>Features</h3>
<ul>
<li>emit warning instead error if file doesn't exist (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/issues/338" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/copy-webpack-plugin/pull/338/hovercard">#338</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/a1c5372">a1c5372</a>)</li>
<li>supports copy nested directories/files in symlink (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/issues/335" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/copy-webpack-plugin/pull/335/hovercard">#335</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/f551c0d">f551c0d</a>)</li>
</ul>
<h3>BREAKING CHANGES</h3>
<ul>
<li>drop support for webpack &lt; 4</li>
<li>drop support for node &lt; 6.9</li>
<li><code>debug</code> option was renamed to <code>logLevel</code>, it only accepts string values: <code>trace</code>, <code>debug</code>, <code>info</code>, <code>warn</code>, <code>error</code> and <code>silent</code></li>
<li>plugin emit warning instead error if file doesn't exist</li>
<li>change <code>prototype</code> of plugin, now you can to get correct plugin name</li>
</ul>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 26 commits.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/517433e3da6cf410dd8930f4d5035b9a6d8cc0dc"><code>517433e</code></a> <code>chore(release): 5.0.0</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/d332212d6421a35c3ef73d9a8cd1464f553a984a"><code>d332212</code></a> <code>test: empty from (#343)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/1f511b85784550788bb33cf8c35e45654fbfaf44"><code>1f511b8</code></a> <code>refactor: debug option (#342)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/e808aa28df31e9815e4e70d3fb9ec2fb45f3949b"><code>e808aa2</code></a> <code>fix: copy only modified files when you use patterns with difference to (#341)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/fbe43cbbf61de05c486607337dec233fef3c2573"><code>fbe43cb</code></a> <code>test: space in directory (#340)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/8f5e63804d47ed91de87c5660bb58654407573ab"><code>8f5e638</code></a> <code>fix: normalize path segment separation (#339)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/a1c537218f19b69c5709b800256b15693592fb28"><code>a1c5372</code></a> <code>feat: emit warning instead error if file doesn't exist (#338)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/f551c0dc1b5b9200564ff79f7c2f3d8de35a620e"><code>f551c0d</code></a> <code>feat: supports copy nested directories/files in symlink (#335)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/2f3ee345f6c11c501a4ba30c8bd46f23ee8fa07a"><code>2f3ee34</code></a> <code>refactor: use <code>Error</code> class for error (#336)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/49a28f07ea7fb235098a472e813ef2f96de4930e"><code>49a28f0</code></a> <code>fix: handles new files when you in watch mode (#333)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/11c9aefe883cf2f5d8d21f57be591489fb50c52c"><code>11c9aef</code></a> <code>refactor: <code>fromArgs</code> option (#332)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/e8706645e13918c6e0ee0b442540ce14a74b04b4"><code>e870664</code></a> <code>refactor: migrate on Set (#331)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/9e1c35e473eb96cb9404b700bc3c25270b1a991a"><code>9e1c35e</code></a> <code>refactor: code (#330)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/ab9439a13ba3a290e262af977dd434e84f7c55a5"><code>ab9439a</code></a> <code>refactor: break compatibility with &lt; webpack 4 (#329)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/commit/61dfe524c581f3932c9725b990e5675a703124a7"><code>61dfe52</code></a> <code>fix: handle <code>[contenthash]</code> as template (#328)</code></li>
</ul>
<p>There are 26 commits in total.</p>
<p>See the <a href="https://urls.greenkeeper.io/webpack-contrib/copy-webpack-plugin/compare/5cf125e9aa7ff60656c7f826ee8f3b9709059e77...517433e3da6cf410dd8930f4d5035b9a6d8cc0dc">full diff</a></p>
</details>

<details>
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package.json

@@ -26,7 +26,7 @@
     "babel-loader": "^8.0.5",
     "babel-preset-env": "^1.7.0",
     "clean-webpack-plugin": "^1.0.1",
-    "copy-webpack-plugin": "^4.5.4",
+    "copy-webpack-plugin": "^5.0.0",
     "prettier": "1.15.2",
     "ts-loader": "^5.3.3",
     "tslint": "^5.12.1",