Update changelog

docs/_includes/changelog.html

@@ -1,6 +1,7 @@
 <h2>Changelog<a href="#changelog"></a></h2>
 <p>For a more detailed changelog, visit <a href="https://github.com/Vestride/Shuffle/releases">the latest releases</a> on GitHub.</p>
 <ul>
+  <li><code>v5.2.2</code> 2019-06-03 - Update TypeScript definitions.</li>
   <li><code>v5.2.1</code> 2018-12-01 - Change `index.d.ts` to use `export default Shuffle` (<a href="https://github.com/Vestride/Shuffle/issues/214#issuecomment-441409237">#214</a>). Upgrade dev dependencies.</li>
   <li><code>v5.2.0</code> 2018-08-19 - Lazily test whether the browser's <code>getComputedStyle</code> includes padding. This allows the bundled file to be imported in node for server side rendering.</li>
   <li><code>v5.1.2</code> 2018-03-26 - Fix misspelled <code>delimiter</code> option. Both "delimiter" and "delimeter" will continue to work for v5.</li>