Add a change log entry for 1.13.4

Author: jgonggrijp

index.html

@@ -2798,6 +2798,18 @@ <h2 id="notes">Notes</h2>
 
       <h2 id="changelog">Change Log</h2>
 
+      <p id="1.13.4">
+        <b class="header">1.13.4</b> &mdash; <small><i>June 2, 2022</i></small> &mdash; <a href="https://github.com/jashkenas/underscore/compare/1.13.3...1.13.4">Diff</a> &mdash; <a href="https://cdn.statically.io/gh/jashkenas/underscore/1.13.4/index.html">Docs</a><br />
+        <ul>
+          <li>
+            Fixes a compatibility issue with WebPack module federation.
+          </li>
+          <li>
+            Documentation improvements.
+          </li>
+        </ul>
+      </p>
+
       <p id="1.13.3">
         <b class="header">1.13.3</b> &mdash; <small><i>April 23, 2022</i></small> &mdash; <a href="https://github.com/jashkenas/underscore/compare/1.13.2...1.13.3">Diff</a> &mdash; <a href="https://cdn.statically.io/gh/jashkenas/underscore/1.13.3/index.html">Docs</a><br />
         <ul>