Added changelog for version 1.12.1.

Author: jlesage

appdefs.xml

@@ -136,6 +136,13 @@ section for more details.
   </documentation>
   <!-- Changelog of the application. -->
   <history>
+      <release>
+        <version>1.12.1</version>
+        <date>2019-09-15</date>
+        <change>Upgraded MakeMKV to version 1.14.5.</change>
+        <change>Fixed fontconfig errors showing during startup.</change>
+        <change>Switched to Azul's Zulu OpenJDK 11.</change>
+      </release>
       <release>
         <version>1.12.0</version>
         <date>2019-06-11</date>