[meld/meld-3-20] Clarify licensing in appdata (#579)

[Kai Willadsen <kaiw src gnome org>]

commit eaa77eb89a72efa6b95b5c54a7f138716a764218
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Fri May 14 16:55:09 2021 +1000

    Clarify licensing in appdata (#579)
    
    Our CC-BY-SA-3.0 licence is just for Meld's documentation, not for code.
    Since the AppStream spec has been updated to clarify that the
    project_license field is for the "main" licence of the code, we'll
    follow that advice.

 data/org.gnome.meld.appdata.xml.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/org.gnome.meld.appdata.xml.in b/data/org.gnome.meld.appdata.xml.in
index 645718d4..c52e8bc7 100644
--- a/data/org.gnome.meld.appdata.xml.in
+++ b/data/org.gnome.meld.appdata.xml.in
@@ -3,7 +3,7 @@
 <component type="desktop">
   <id>org.gnome.meld.desktop</id>
   <metadata_license>CC0-1.0</metadata_license>
-  <project_license>GPL-2.0+ and CC-BY-SA-3.0</project_license>
+  <project_license>GPL-2.0+</project_license>
   <_name>Meld</_name>
   <_summary>Compare and merge your files</_summary>
   <description>