Update ws to the latest version 🚀 (#67)

## Version **6.0.0** of **ws** was just published.

<table>
  <tr>
    <th align=left>
      Dependency
    </th>
    <td>
      <a target=_blank href=https://github.com/websockets/ws>ws</a>
    </td>
  </tr>
  <tr>
      <th align=left>
       Current Version
      </th>
      <td>
        5.2.2
      </td>
    </tr>
  <tr>
    <th align=left>
      Type
    </th>
    <td>
      dependency
    </td>
  </tr>
</table>



The version **6.0.0** 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.

It might be worth looking into these changes and trying to get this project onto the latest version of ws.

If you have a solid test suite and good coverage, a passing build is a strong indicator that you can take advantage of these changes directly by merging the proposed change into your project. If the build fails or you don’t have such unconditional trust in your tests, this branch is a great starting point for you to work on the update.


---


<details>
<summary>Release Notes</summary>
<strong>6.0.0</strong>

<h1>Breaking changes</h1>
<ul>
<li>Dropped support for Node.js 4 (<a class="commit-link" href="https://urls.greenkeeper.io/websockets/ws/commit/d73885c3f7c70b583030d683d9a0a025c98fbe00"><tt>d73885c</tt></a>).</li>
<li>Added a shim that throws an error when used if the package is bundled for the<br>
browser (<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="310221102" data-permission-text="Issue title is private" data-url="websockets/ws#1345" href="https://urls.greenkeeper.io/websockets/ws/pull/1345">#1345</a>).</li>
<li>Added a <code>maxPayload</code> option on the client. Defaults to 100 MiB (<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="333186455" data-permission-text="Issue title is private" data-url="websockets/ws#1402" href="https://urls.greenkeeper.io/websockets/ws/pull/1402">#1402</a>).</li>
<li>Dropped support for the <code>memLevel</code> and <code>level</code> options. Use<br>
<code>zlibDeflateOptions</code> instead. (<a class="commit-link" href="https://urls.greenkeeper.io/websockets/ws/commit/80e20021f314d66e80032ecb8c2854ac61c6073c"><tt>80e2002</tt></a>).</li>
</ul>
</details>

<details>
<summary>Commits</summary>
<p>The new version differs by 15 commits ahead by 15, behind by 2.</p>
<ul>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/1ee42fd67d365409096c11af0d6bc70fbe292c60"><code>1ee42fd</code></a> <code>[dist] 6.0.0</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/d963003a40bfe6cdd58eb3d3e4458eb2b2090a2c"><code>d963003</code></a> <code>[example] Update dependencies</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/38d2e8b3f75ebccf8b0b205fafac959c1702ddfb"><code>38d2e8b</code></a> <code>chore(package): update eslint-plugin-node to version 7.0.0 (#1420)</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/fc957939460cd0c461618bef4c6d59a9b5a4b90e"><code>fc95793</code></a> <code>[fix] Fix use after invalidation bug</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/fbd43914ad557ed915c41108b2f98b508a720216"><code>fbd4391</code></a> <code>[fix] Fix compatibility with Node.js 6</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/b354cd138e62dcb1e4e05ce8b0bc097534f23d76"><code>b354cd1</code></a> <code>[minor] Remove no longer needed workaround for <code>socketPath</code> option</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/ef5a8f5f5e4d3843d318d2b8a463b49d8105bd2e"><code>ef5a8f5</code></a> <code>[pkg] Update eslint-plugin-standard to version 3.1.0</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/80e20021f314d66e80032ecb8c2854ac61c6073c"><code>80e2002</code></a> <code>[major] Drop support for the <code>memLevel</code> and <code>level</code> options</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/92d0a2e9fc2b1cca6eb1ddf88ec4347986164cb1"><code>92d0a2e</code></a> <code>[major] Add <code>maxPayload</code> option for the client (#1402)</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/9f87842888688318464af498300395b197b29712"><code>9f87842</code></a> <code>[major] Make bundlers use a browser shim that throws an error (#1345)</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/72bfbe84f3d747b96416a646728932c9181ceffd"><code>72bfbe8</code></a> <code>chore(package): update bufferutil to version 4.0.0 (#1413)</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/5bb29ed019529f17a557d59b3eb5d9a14f9e5643"><code>5bb29ed</code></a> <code>chore(package): update utf-8-validate to version 5.0.0 (#1415)</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/3bc6b9672f60b7178f115e51beaf4f664f91484c"><code>3bc6b96</code></a> <code>chore(package): update eslint to version 5.0.0 (#1403)</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/d73885c3f7c70b583030d683d9a0a025c98fbe00"><code>d73885c</code></a> <code>[major] Drop support for Node.js 4</code></li>
<li><a href="https://urls.greenkeeper.io/websockets/ws/commit/5d90141505dc41c129ab5d5228e37d49979d7541"><code>5d90141</code></a> <code>chore(package): update eslint-plugin-import to version 2.13.0 (#1405)</code></li>
</ul>
<p>See the <a href="https://urls.greenkeeper.io/websockets/ws/compare/5d55e52529167c25f4fec35cb4753294e75bf9f2...1ee42fd67d365409096c11af0d6bc70fbe292c60">full diff</a></p>
</details>

<details>
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</details>

---


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package.json

@@ -31,7 +31,7 @@
     "serve-static": "^1.13.2",
     "throttleit": "^1.0.0",
     "tmp": "0.0.33",
-    "ws": "^5.1.1",
+    "ws": "^6.0.0",
     "ws-events": "^1.0.0",
     "xhr": "^2.4.1"
   },