Update uglify-js in group plugins to the latest version � (#594)

Summary:
## The devDependency [uglify-js](https://github.com/mishoo/UglifyJS2) was updated from `3.6.2` to `3.6.3`.
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.

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**Publisher:** [alexlamsl](https://www.npmjs.com/~alexlamsl)
**License:** BSD-2-Clause

<details>
<summary>Release Notes for v3.6.3</summary>

<p> </p>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 18 commits.</p>
<ul>
<li><a href="6b4886c908"><code>6b4886c</code></a> <code>v3.6.3</code></li>
<li><a href="0201cb4b52"><code>0201cb4</code></a> <code>fix corner case in <code>unused</code> (#3499)</code></li>
<li><a href="cd072317d0"><code>cd07231</code></a> <code>fix corner case in <code>unused</code> (#3496)</code></li>
<li><a href="0785a15ace"><code>0785a15</code></a> <code>fix corner case in <code>dead_code</code> &amp; <code>ie8</code> (#3494)</code></li>
<li><a href="b1279a46d9"><code>b1279a4</code></a> <code>fix corner case in <code>sequences</code> (#3491)</code></li>
<li><a href="b571619d31"><code>b571619</code></a> <code>handle <code>throw</code> of non-<code>Error</code>s gracefully (#3492)</code></li>
<li><a href="7b5350b459"><code>7b5350b</code></a> <code>tweak Travis CI execution environment (#3489)</code></li>
<li><a href="1549db70e6"><code>1549db7</code></a> <code>fix corner case in <code>ie8</code> (#3487)</code></li>
<li><a href="8ff9a3c8fb"><code>8ff9a3c</code></a> <code>fix corner cases in <code>ie8</code> (#3485)</code></li>
<li><a href="91cae51d8f"><code>91cae51</code></a> <code>fix corner case in <code>evaluate</code> &amp; <code>ie8</code> (#3483)</code></li>
<li><a href="8af2f5fbcf"><code>8af2f5f</code></a> <code>fix corner case in <code>rename</code> (#3481)</code></li>
<li><a href="86a8016323"><code>86a8016</code></a> <code>fix corner case in <code>ie8</code> &amp; <code>mangle</code> (#3479)</code></li>
<li><a href="009dcdae01"><code>009dcda</code></a> <code>avoid mangling of <code>MutationObserver</code> properties (#3477)</code></li>
<li><a href="f86f615d83"><code>f86f615</code></a> <code>fix corner case in <code>ie8</code> &amp; <code>mangle</code> (#3476)</code></li>
<li><a href="d3d1d11926"><code>d3d1d11</code></a> <code>fix corner case in <code>ie8</code> &amp; <code>rename</code> (#3474)</code></li>
</ul>
<p>There are 18 commits in total.</p>
<p>See the <a href="c3ca293e6b...6b4886c908">full diff</a></p>
</details>

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<details>
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Your [Greenkeeper](https://greenkeeper.io) bot 🌴
Pull Request resolved: https://github.com/facebook/flipper/pull/594

Reviewed By: jknoxville

Differential Revision: D18035631

Pulled By: passy

fbshipit-source-id: 0de12654bd434ccf29e67907febeb1aca85558c9

src/plugins/sections/d3/package.json

@@ -57,7 +57,7 @@
     "jsdom": "^15.1.1",
     "seedrandom": "^3.0.5",
     "smash": "0.0",
-    "uglify-js": "3.6.2",
+    "uglify-js": "^3.6.3",
     "vows": "0.8"
   },
   "scripts": {