Update appdata

Author: hanna-kn

data/qalculate-gtk.appdata.xml.in

@@ -65,6 +65,7 @@
       <li>Always perform conversion to optimal (SI) unit when the expression is a number multiplied by a unit and input equals output</li>
       <li>Improvements and fixes in insert function dialog</li>
       <li>Compiled definitions without GIO and with support for out-of-tree builds</li>
+      <li>Fix availability of many currencies before manual exchange rates update</li>
       <li>Fix programming keypad base conversion for negative integers</li>
       <li>Minor bug fixes and feature improvements</li>
      </ul>