Update css-loader to the latest version 🚀 (#71)

## The devDependency [css-loader](https://github.com/webpack-contrib/css-loader) was updated from `1.0.1` to `2.0.0`.
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 v2.0.0</summary>

<p><a name="user-content-2.0.0"></a></p>
<h1><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/compare/v1.0.1...v2.0.0">2.0.0</a> (2018-12-07)</h1>
<p>The main <strong>BREAKING CHANGES</strong>:</p>
<ul>
<li>css modules <strong>are disabled by default</strong>, you need setup their use <code>modules</code> option. You can setup their using <code>local</code> (<code>true</code> is alias for this value) and <code>global</code> (previous behaviour) value. Why it is disabled by default? A lot of developers use <code>css</code> without css modules features and they get performance problems due <code>postcss</code> plugins spend time on analyze and processing file.</li>
<li>resolving logic for <code>uls()</code> and <code>import</code> at-rules works the same everywhere, it does not matter whether css modules are enabled (with <code>global</code> and <code>local</code> module) or not. Examples - <code>url('image.png')</code> as <code>require('./image.png')</code>, <code>url('./image.png')</code> as <code>require('./image.png')</code>, <code>url('~module/image.png')</code> as <code>require('module/image.png')</code>.</li>
</ul>
<h3>Bug Fixes</h3>
<ul>
<li>broken unucode characters (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/850" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/850/hovercard">#850</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/f599c70">f599c70</a>)</li>
<li>correctly processing <code>urls()</code> with <code>?#hash</code> (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/803" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/803/hovercard">#803</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/417d105">417d105</a>)</li>
<li>don't break loader on invalid or not exists url or import token (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/827" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/827/hovercard">#827</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/9e52d26">9e52d26</a>)</li>
<li>don't duplicate import with same media in different case (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/819" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/819/hovercard">#819</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/9f66e33">9f66e33</a>)</li>
<li>emit warnings on broken <code>import</code> at-rules (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/806" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/806/hovercard">#806</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/4bdf08b">4bdf08b</a>)</li>
<li>handle uppercase <code>URL</code> in <code>import</code> at-rules (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/818" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/818/hovercard">#818</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/3ebdcd5">3ebdcd5</a>)</li>
<li>inconsistent generate class names for css modules on difference os (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/812" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/812/hovercard">#812</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/0bdf9b7">0bdf9b7</a>)</li>
<li>reduce number of <code>require</code> for <code>urls()</code> (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/854" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/854/hovercard">#854</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/3338656">3338656</a>)</li>
<li>support deduplication of string module ids (optimization.namedModules) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/789" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/789/hovercard">#789</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/e3bb83a">e3bb83a</a>)</li>
<li>support module resolution in <code>composes</code> (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/845" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/845/hovercard">#845</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/453248f">453248f</a>)</li>
<li>same <code>urls()</code> resolving logic for <code>modules</code> (<code>local</code> and <code>global</code>) and without modules (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/843" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/843/hovercard">#843</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/fdcf687">fdcf687</a>)</li>
</ul>
<h3>Features</h3>
<ul>
<li>allow to disable css modules and <strong>disable their by default</strong> (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/842" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/842/hovercard">#842</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/889dc7f">889dc7f</a>)</li>
<li>disable <code>import</code> option doesn't affect on <code>composes</code> (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/822" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/822/hovercard">#822</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/f9aa73c">f9aa73c</a>)</li>
<li>allow to filter <code>urls</code> (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/856" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/856/hovercard">#856</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/5e702e7">5e702e7</a>)</li>
<li>allow to filter <code>import</code> at-rules (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/857" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/857/hovercard">#857</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/5e6034c">5e6034c</a>)</li>
<li>emit warning on invalid <code>urls()</code> (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/832" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/832/hovercard">#832</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/da95db8">da95db8</a>)</li>
<li>added <code>exportOnlyLocals</code> option (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/824" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/824/hovercard">#824</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/e9327c0">e9327c0</a>)</li>
<li>reuse <code>postcss</code> ast from other loaders (i.e <code>postcss-loader</code>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/issues/840" data-hovercard-type="pull_request" data-hovercard-url="/webpack-contrib/css-loader/pull/840/hovercard">#840</a>) (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/1dad1fb">1dad1fb</a>)</li>
<li>schema options (<a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/b97d997">b97d997</a>)</li>
</ul>
<h3>BREAKING CHANGES</h3>
<ul>
<li>resolving logic for <code>uls()</code> and <code>import</code> at-rules works the same everywhere, it does not matter whether css modules are enabled (with <code>global</code> and <code>local</code> module) or not. Examples - <code>url('image.png')</code> as <code>require('./image.png')</code>, <code>url('./image.png')</code> as <code>require('./image.png')</code>, <code>url('~module/image.png')</code> as <code>require('module/image.png')</code>.</li>
<li>by default css modules are disabled (now <code>modules: false</code> disable all css modules features), you can return old behaviour change this on <code>modules: 'global'</code></li>
<li><code>css-loader/locals</code> was dropped in favor <code>exportOnlyLocals</code> option</li>
<li><code>import</code> option only affect on <code>import</code> at-rules and doesn't affect on <code>composes</code> declarations</li>
<li>invalid <code>@import</code> at rules now emit warnings</li>
<li>use <code>postcss@7</code></li>
</ul>
<h3>Bonus</h3>
<ul>
<li>code refactoring, updating deps and reusing <code>postcss</code> ast increase performance</li>
</ul>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 67 commits.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/634ab49c17b284e55e62105109412ebd37e234b5"><code>634ab49</code></a> <code>chore(release): 2.0.0</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/6ade2d0e7c04031c79841f1f741d986430a5aed7"><code>6ade2d0</code></a> <code>refactor: remove unused file (#860)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/e7525c90718018b75321f1e04909d6937b6ad140"><code>e7525c9</code></a> <code>test: nested url (#859)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/7259faa89dc70830d69b7eb7baf4163065b63679"><code>7259faa</code></a> <code>test: css hacks (#858)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/5e6034cee840d47dbfd9fdede87a152e4cfc466a"><code>5e6034c</code></a> <code>feat: allow to filter import at-rules (#857)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/5e702e7d2e081b7f6d372f0c967fdfca6a40a584"><code>5e702e7</code></a> <code>feat: allow filtering urls (#856)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/9642aa5ad70282f5a7bef8e95ceefdc834af1af1"><code>9642aa5</code></a> <code>test: css stuff (#855)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/333865645e21c15e8589724317111d9d6badbeba"><code>3338656</code></a> <code>fix: reduce number of require for url (#854)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/533abbe8cf2b937751f3d4501816611a230083d2"><code>533abbe</code></a> <code>test: issue 636 (#853)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/08c551cc78bb484a4f947047cbc46b305e733d7e"><code>08c551c</code></a> <code>refactor: better warning on invalid url resolution (#852)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/b0aa159cbb951774a2c09b37f093dd95d23ebbd3"><code>b0aa159</code></a> <code>test: issue #589 (#851)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/f599c7087466ca293989531805ef367b388d13f1"><code>f599c70</code></a> <code>fix: broken unucode characters (#850)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/1e551f338bf6a22541e3dab7943429b01cae02ab"><code>1e551f3</code></a> <code>test: issue 286 (#849)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/419d27b0836be683a1f0cc786ec47e7f80617842"><code>419d27b</code></a> <code>docs: improve readme (#848)</code></li>
<li><a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/commit/d94a698d9d144fb91a9d1fdfb8cd4433e410e70e"><code>d94a698</code></a> <code>refactor: webpack-default (#847)</code></li>
</ul>
<p>There are 67 commits in total.</p>
<p>See the <a href="https://urls.greenkeeper.io/webpack-contrib/css-loader/compare/10c3bc31bedcfffe35a8e65e82397d4dd632f6c0...634ab49c17b284e55e62105109412ebd37e234b5">full diff</a></p>
</details>

<details>
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package.json

@@ -33,7 +33,7 @@
     "chai": "^4.1.2",
     "coveralls": "^3.0.0",
     "create-react-class": "^15.6.2",
-    "css-loader": "^1.0.0",
+    "css-loader": "^2.0.0",
     "editorconfig-tools": "^0.1.1",
     "enzyme": "^3.5.1",
     "enzyme-adapter-react-16": "^1.4.0",