Update changelog: timer pausing

src/routes/index.svelte

@@ -69,6 +69,9 @@ on:solved={()=>hexWrapSolved = true}
 <div class="container">
 <h2> Changelog </h2>
 <ul>
+    <li>
+        <em>2022-08-13</em> The timer now stops ticking when you leave the puzzle page or switch to a different tab. It continues when you return to the puzzle. This should give more accurate times on large puzzles. Thanks to <a href="https://github.com/joshwilsonvu" target="_blank" rel="noopener">@joshwilsonvu</a> for the pull request.
+    </li>
     <li><em>2022-08-11</em> Zoom and pan! Solving big puzzles should be easier now with the ability to zoom in and move around. 
         A summary of improved controls:
         <ul>