[gnome-builder] appdata: add missing developer_name field

[Christian Hergert <chergert src gnome org>]

commit 0ebc1c0e88b3c90cb061da3bad4be00fe0f0dba1
Author: Christian Hergert <chergert redhat com>
Date:   Tue Oct 2 12:05:20 2018 -0700

    appdata: add missing developer_name field

 data/org.gnome.Builder.appdata.xml.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/data/org.gnome.Builder.appdata.xml.in b/data/org.gnome.Builder.appdata.xml.in
index 0afb63aba..b5078d817 100644
--- a/data/org.gnome.Builder.appdata.xml.in
+++ b/data/org.gnome.Builder.appdata.xml.in
@@ -6,6 +6,7 @@
   <project_license>GPL-3.0+ and GPL-2.0+ and LGPL-3.0+ and LGPL-2.0+ and MIT</project_license>
   <name>Builder</name>
   <summary>An IDE for GNOME</summary>
+  <developer_name>Christian Hergert, et al.</developer_name>
 
   <description>
     <p>