[meld] Fix incorrect appdata tags

[Kai Willadsen <kaiw src gnome org>]

commit 26fe6fa90bb035da77be3a4a58cae79003c41c4c
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sat Sep 21 09:25:49 2019 +1000

    Fix incorrect appdata tags

 data/org.gnome.meld.appdata.xml.in | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)
---
diff --git a/data/org.gnome.meld.appdata.xml.in b/data/org.gnome.meld.appdata.xml.in
index 4429ca4c..89a0e4af 100644
--- a/data/org.gnome.meld.appdata.xml.in
+++ b/data/org.gnome.meld.appdata.xml.in
@@ -2,8 +2,9 @@
 <!-- Copyright 2013-2014 Kai Willadsen <kai willadsen gmail com> -->
 <component type="desktop">
   <id>org.gnome.meld.desktop</id>
-  <metadatalicense>CC0-1.0</metadatalicense>
-  <projectlicense>GPL-2.0+ and CC-BY-SA-3.0</projectlicense>
+  <translation type="gettext">meld</translation>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-2.0+ and CC-BY-SA-3.0</project_license>
   <name>Meld</name>
   <summary>Compare and merge your files</summary>
   <description>
@@ -42,11 +43,11 @@
   <url type="bugtracker">https://gitlab.gnome.org/GNOME/meld/issues</url>
   <url type="donation">http://www.gnome.org/friends/</url>
   <url type="translate">https://wiki.gnome.org/TranslationProject</url>
-  <updatecontact>kai willadsen gmail com</updatecontact>
-  <projectgroup>GNOME</projectgroup>
-  <developername>The GNOME Project</developername>
+  <update_contact>kai willadsen gmail com</update_contact>
+  <project_group>GNOME</project_group>
+  <developer_name>The GNOME Project</developer_name>
   <translation type="gettext">meld</translation>
-  <contentrating type="oars-1.1" />
+  <content_rating type="oars-1.1" />
   <releases>
     <release date="2019-01-06" version="3.20.0">
       <description>