Add reference to uucp group for Arch Linux.

Author: ntoll

index.html

@@ -62,7 +62,7 @@ <h3>Mu for OSX</h3>
         <h3>Mu for Linux</h3>
         <p>Make the file executable
         (<code>chmod +x mu.bin</code>). Ensure membership of the
-        <code>dialout</code> group.</p>
+        <code>dialout</code> or <code>uucp</code> groups.</p>
         <p><a href="https://github.com/mu-editor/mu/releases/download/v0.9.13/mu-0.9.13.linux.bin" class="btn btn-primary" role="button">Download for Linux</a></p>
       </div>
     </div>