Update babel-eslint to the latest version 🚀 (#601)

## The devDependency [babel-eslint](https://github.com/babel/babel-eslint) was updated from `9.0.0` to `10.0.0`.
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 v10.0.0</summary>

<h1>v10.0.0</h1>
<p>Small breaking change: add a peerDependency starting from the ESLint version that added a parser feature that we were monkeypatching before (and drop that code). If already using ESLint 5 shouldn't be any different.</p>
<ul>
<li>Bugfix for <code>TypeAlias</code>: <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="290308427" data-permission-text="Issue title is private" data-url="babel/babel-eslint#584" href="https://urls.greenkeeper.io/babel/babel-eslint/pull/584">#584</a></li>
</ul>
<div class="highlight highlight-source-js"><pre><span class="pl-c"><span class="pl-c">/*</span> @flow <span class="pl-c">*/</span></span>
type <span class="pl-c1">Node</span><span class="pl-k">&lt;</span><span class="pl-c1">T</span><span class="pl-k">&gt;</span> <span class="pl-k">=</span> { head<span class="pl-k">:</span> <span class="pl-c1">T</span>; tail<span class="pl-k">:</span> <span class="pl-c1">Node</span><span class="pl-k">&lt;</span><span class="pl-c1">T</span><span class="pl-k">&gt;</span> }

<span class="pl-c"><span class="pl-c">//</span> or </span>

type <span class="pl-c1">File</span> <span class="pl-k">=</span> {chunks<span class="pl-k">:</span> <span class="pl-c1">Array</span><span class="pl-k">&lt;</span>Chunk<span class="pl-k">&gt;</span>}
type Chunk <span class="pl-k">=</span> {file<span class="pl-k">:</span> <span class="pl-c1">File</span>}</pre></div>
<ul>
<li>Update to test against ESLint 5, add a peerDependency: <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="363695123" data-permission-text="Issue title is private" data-url="babel/babel-eslint#689" href="https://urls.greenkeeper.io/babel/babel-eslint/pull/689">#689</a></li>
<li>Drop monkeypatching behavior: <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="363706472" data-permission-text="Issue title is private" data-url="babel/babel-eslint#690" href="https://urls.greenkeeper.io/babel/babel-eslint/pull/690">#690</a></li>
</ul>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 5 commits.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/8f78e280a22def1128cd847b73fd7f221a047ed2"><code>8f78e28</code></a> <code>10.0.0</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/717fba7f5605f4dc1cc5531a7c24d5c9ab37a8a2"><code>717fba7</code></a> <code>test value should be switched</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/020d012c554913fea137f4129798ce31a4896dfe"><code>020d012</code></a> <code>Treat type alias declarationlike function declaration (#584)</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/b400cb1b38aaa8999d2a43f381f3ee861469ab98"><code>b400cb1</code></a> <code>Test eslint5, update peerDep (#690)</code></li>
<li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/c333bd64cb014cac8b56062421e9a5c0d28d798b"><code>c333bd6</code></a> <code>Drop old monkeypatching behavior (#689)</code></li>
</ul>
<p>See the <a href="https://urls.greenkeeper.io/babel/babel-eslint/compare/6aa8b6f02ff83cfb14eae2432f226f113929a50f...8f78e280a22def1128cd847b73fd7f221a047ed2">full diff</a></p>
</details>

<details>
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</details>

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package.json

@@ -22,7 +22,7 @@
     "babel": "^6.5.2",
     "babel-cli": "^6.26.0",
     "babel-core": "^6.6.4",
-    "babel-eslint": "^9.0.0",
+    "babel-eslint": "^10.0.0",
     "babel-plugin-istanbul": "^4.1.5",
     "babel-plugin-syntax-decorators": "^6.5.0",
     "babel-plugin-transform-class-properties": "^6.6.0",