Add two more Changelog entries.

Author: daute

ChangeLog

@@ -7,6 +7,8 @@ Now:
  * More cases of modern wxWidgets signal handling
  * svg support that unfortunately lacks a font renderer
  * Right-click menus for the symbols sidebars
+ * (Mostly) fixed the index in the manual
+ * Allow building and installing the manual in other formats (epub, pdf, ...)
 
 19.12.1:
  * Made the tooltips more visible

data/io.github.wxmaxima_developers.wxMaxima.appdata.xml

@@ -65,6 +65,8 @@
 	  <li>More cases of modern wxWidgets signal handling</li>
 	  <li>SVG support that unfortunately lacks a font renderer</li>
 	  <li>Right-click menus for the symbols sidebars</li>
+	  <li>(Mostly) fixed the index in the manual</li>
+	  <li>Allow building and installing the manual in other formats (epub, pdf, ...)</li>
         </ul>
       </description>
     </release>