chore(deps): bump async from 2.6.3 to 2.6.4 (#151)

Bumps [async](https://github.com/caolan/async) from 2.6.3 to 2.6.4.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md">async's changelog</a>.</em></p>
<blockquote>
<h1>v2.6.4</h1>
<ul>
<li>Fix potential prototype pollution exploit (<a href="https://github-redirect.dependabot.com/caolan/async/issues/1828">#1828</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/caolan/async/commit/c6bdaca4f9175c14fc655d3783c6af6a883e6514"><code>c6bdaca</code></a> Version 2.6.4</li>
<li><a href="https://github.com/caolan/async/commit/8870da9d5022bab310413041b4079e10db3980b7"><code>8870da9</code></a> Update built files</li>
<li><a href="https://github.com/caolan/async/commit/4df6754ef4e96a742956df8782fee27242a2ea12"><code>4df6754</code></a> update changelog</li>
<li><a href="https://github.com/caolan/async/commit/8f7f90342a6571ba1c197d747ebed30c368096d2"><code>8f7f903</code></a> Fix prototype pollution vulnerability (<a href="https://github-redirect.dependabot.com/caolan/async/issues/1828">#1828</a>)</li>
<li>See full diff in <a href="https://github.com/caolan/async/compare/v2.6.3...v2.6.4">compare view</a></li>
</ul>
</details>
<details>
<summary>Maintainer changes</summary>
<p>This version was pushed to npm by <a href="https://www.npmjs.com/~hargasinski">hargasinski</a>, a new releaser for async since your current version.</p>
</details>
<br />


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</details>

Author: dependabot[bot]

yarn.lock

@@ -1266,9 +1266,9 @@ async-foreach@^0.1.3:
   integrity sha1-NhIfhFwFeBct5Bmpfb6x0W7DRUI=
 
 async@^2.0.1, async@^2.1.5:
-  version "2.6.3"
-  resolved "https://registry.yarnpkg.com/async/-/async-2.6.3.tgz#d72625e2344a3656e3a3ad4fa749fa83299d82ff"
-  integrity sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==
+  version "2.6.4"
+  resolved "https://registry.yarnpkg.com/async/-/async-2.6.4.tgz#706b7ff6084664cd7eae713f6f965433b5504221"
+  integrity sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==
   dependencies:
     lodash "^4.17.14"