Update babel-loader to the latest version 🚀 (#18)

## The devDependency [babel-loader](https://github.com/babel/babel-loader) was updated from `7.1.5` to `8.0.3`.
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 v8.0.3</summary>

<h3>Features</h3>
<ul>
<li><a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="363280376" data-permission-text="Issue title is private" data-url="babel/babel-loader#687" href="https://urls.greenkeeper.io/babel/babel-loader/pull/687">#687</a> - Add <code>customize</code> option</li>
</ul>
<h3>Bugs</h3>
<ul>
<li><a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="362860284" data-permission-text="Issue title is private" data-url="babel/babel-loader#685" href="https://urls.greenkeeper.io/babel/babel-loader/pull/685">#685</a> - Also pass the caller option to loadPartialConfig</li>
</ul>
<h3>Docs</h3>
<ul>
<li><a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="361610577" data-permission-text="Issue title is private" data-url="babel/babel-loader#681" href="https://urls.greenkeeper.io/babel/babel-loader/pull/681">#681</a> - Update the README links to use the new options docs</li>
<li><a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="362787813" data-permission-text="Issue title is private" data-url="babel/babel-loader#683" href="https://urls.greenkeeper.io/babel/babel-loader/pull/683">#683</a> - Add .mjs to the examples</li>
</ul>
<h3>Internal</h3>
<p>Some dev dependency updates and CI tweaks.</p>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 77 commits ahead by 77, behind by 9.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/800181b91dc4136bdb1d068f1fe730998eac6512"><code>800181b</code></a> <code>8.0.3</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/7d8500ced72046d4c5c1dcdc7a9c0016d7e6c15b"><code>7d8500c</code></a> <code>Also pass the caller option to loadPartialConfig (#685)</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/a50791472f1f706bf2ec4ea06427df2dd8b31080"><code>a507914</code></a> <code>Expose the full loader options to all overrides hooks.</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/ac0c869b86b98881ac5544bf7248c63a971b7219"><code>ac0c869</code></a> <code>Tweak the customize implementation to be a bit more strict.</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/9b70a02b3069000133122c09271ce0a7144f8dae"><code>9b70a02</code></a> <code>Add overrides option</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/c8d7a7287a6b0dc60480b026159f0486ac9bf074"><code>c8d7a72</code></a> <code>Add .mjs to the examples (#683)</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/461999323585fdaa420530a9f85ff5701a7d298e"><code>4619993</code></a> <code>bable options link update (#681)</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/8f240b498bb24ef89f7b306f5ac806e84b813b0d"><code>8f240b4</code></a> <code>Use node 10 on appveyor</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/7e4189ebb6e313df460de25949503e73cb260bf6"><code>7e4189e</code></a> <code>Change appveyor to use babel account</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/eeaee463232e786d030716894ed4f66e505acbde"><code>eeaee46</code></a> <code>Update devDeps to use most recent versions, and fix tests.</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/3e5fb5e3ab9bd02d6955625bde4c71fee1619473"><code>3e5fb5e</code></a> <code>chore(package): update lockfile</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/2b8e479e50ce6dc7fc0bc5ae700951b9631a4959"><code>2b8e479</code></a> <code>chore(package): update eslint-config-babel to version 8.0.0</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/0e43d0ab51d3b3f627e39d82e85b40a99c6316e3"><code>0e43d0a</code></a> <code>8.0.2</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/5e0565d1199bcf42c238657f48460727680a2864"><code>5e0565d</code></a> <code>Manually fix 'inline' sourcemaps so they work with Webpack. (#671)</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-loader/commit/ea52d05a41c4b44288348093ac3bb7ef52fa60bc"><code>ea52d05</code></a> <code>Use 'sourceMaps' since that is what we suggest to use in our docs. (#670)</code></li>
</ul>
<p>There are 77 commits in total.</p>
<p>See the <a href="https://urls.greenkeeper.io/babel/babel-loader/compare/f3bfed932a959f7ffe3633e7f88cba0f3fcbf7b2...800181b91dc4136bdb1d068f1fe730998eac6512">full diff</a></p>
</details>

<details>
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package.json

@@ -21,7 +21,7 @@
   "devDependencies": {
     "babel-cli": "^6.24.1",
     "babel-core": "^6.25.0",
-    "babel-loader": "^7.1.1",
+    "babel-loader": "^8.0.3",
     "babel-plugin-transform-es2015-modules-commonjs": "^6.24.1",
     "babel-plugin-transform-es2015-modules-umd": "^6.24.1",
     "babel-plugin-transform-object-assign": "^6.22.0",