appdata.xml: Add content rating from the OARS

This is required for publishing on Flathub.

appdata.xml: Add content rating from the OARS
This is required for publishing on Flathub.
48837d25 · Timothée Ravier · d9488e1f · 48837d25
Verified Commit 48837d25 authored Jul 24, 2020 by Timothée Ravier
--- a/org.kde.kcalc.appdata.xml
+++ b/org.kde.kcalc.appdata.xml
@@ -329,4 +329,5 @@
    <release version="20.04.1" date="2020-05-14"/>
    <release version="20.04.0" date="2020-04-23"/>
  </releases>
+  <content_rating type="oars-1.1" />
 </component>