Bump terser from 4.6.11 to 4.8.1 (#15)

Bumps [terser](https://github.com/terser/terser) from 4.6.11 to 4.8.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/terser/terser/blob/master/CHANGELOG.md">terser's
changelog</a>.</em></p>
<blockquote>
<h2>v4.8.1 (backport)</h2>
<ul>
<li>Security fix for RegExps that should not be evaluated (regexp
DDOS)</li>
</ul>
<h2>v4.8.0</h2>
<ul>
<li>Support for numeric separators (<code>million = 1_000_000</code>)
was added.</li>
<li>Assigning properties to a class is now assumed to be pure.</li>
<li>Fixed bug where <code>yield</code> wasn't considered a valid
property key in generators.</li>
</ul>
<h2>v4.7.0</h2>
<ul>
<li>A bug was fixed where an arrow function would have the wrong
size</li>
<li><code>arguments</code> object is now considered safe to retrieve
properties from (useful for <code>length</code>, or <code>0</code>) even
when <code>pure_getters</code> is not set.</li>
<li>Fixed erroneous <code>const</code> declarations without value (which
is invalid) in some corner cases when using
<code>collapse_vars</code>.</li>
</ul>
<h2>v4.6.13</h2>
<ul>
<li>Fixed issue where ES5 object properties were being turned into ES6
object properties due to more lax unicode rules.</li>
<li>Fixed parsing of BigInt with lowercase <code>e</code> in them.</li>
</ul>
<h2>v4.6.12</h2>
<ul>
<li>Fixed subtree comparison code, making it see that <code>[1,[2,
3]]</code> is different from <code>[1, 2, [3]]</code></li>
<li>Printing of unicode identifiers has been improved</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/terser/terser/commit/40674a433e2b2fd9dfe7aaa93a0da224fb5e76b9"><code>40674a4</code></a>
update changelog, version</li>
<li><a
href="https://github.com/terser/terser/commit/d8cc5691be980d663c29cc4d5ce67e852d597012"><code>d8cc569</code></a>
backport fix to potential regexp DDOS</li>
<li><a
href="https://github.com/terser/terser/commit/504b9677d2d6086025ead5afb713e151877944b2"><code>504b967</code></a>
4.8.0</li>
<li><a
href="https://github.com/terser/terser/commit/9f380dc4b4aa53407dc513bacafd527090546af3"><code>9f380dc</code></a>
update changelog</li>
<li><a
href="https://github.com/terser/terser/commit/7dd0b9d463f427eba75b608747b2e4880a8837de"><code>7dd0b9d</code></a>
update assumptions</li>
<li><a
href="https://github.com/terser/terser/commit/cfad9072984dd0921b002cabd8eb9748e5be1341"><code>cfad907</code></a>
Allow yield to be used as property key in generators.</li>
<li><a
href="https://github.com/terser/terser/commit/283f44f5dfc0057b604bc3c00604949963a84645"><code>283f44f</code></a>
Make class property assignment pure.</li>
<li><a
href="https://github.com/terser/terser/commit/ee965e8d9e8c47583126f1ae11d0da825e55aa89"><code>ee965e8</code></a>
Add numeric separators support (<a
href="https://redirect.github.com/terser/terser/issues/725">#725</a>)</li>
<li><a
href="https://github.com/terser/terser/commit/ee6b8af8f5bac4f18fe1d0485639db8fac660296"><code>ee6b8af</code></a>
4.7.0</li>
<li><a
href="https://github.com/terser/terser/commit/807f729a1e3ff350946155400888d22b3a8b2d25"><code>807f729</code></a>
update changelog</li>
<li>Additional commits viewable in <a
href="https://github.com/terser/terser/compare/v4.6.11...v4.8.1">compare
view</a></li>
</ul>
</details>
<br />


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yarn.lock

@@ -8579,9 +8579,9 @@ terser-webpack-plugin@^1.4.3:
     worker-farm "^1.7.0"
 
 terser@^4.1.2:
-  version "4.6.11"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-4.6.11.tgz#12ff99fdd62a26de2a82f508515407eb6ccd8a9f"
-  integrity sha512-76Ynm7OXUG5xhOpblhytE7X58oeNSmC8xnNhjWVo8CksHit0U0kO4hfNbPrrYwowLWFgM2n9L176VNx2QaHmtA==
+  version "4.8.1"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-4.8.1.tgz#a00e5634562de2239fd404c649051bf6fc21144f"
+  integrity sha512-4GnLC0x667eJG0ewJTa6z/yXrbLGv80D9Ru6HIpCQmO+Q4PfEtBFi0ObSckqwL6VyQv/7ENJieXHo2ANmdQwgw==
   dependencies:
     commander "^2.20.0"
     source-map "~0.6.1"