[gnome-software] trivial: Fix an appstreamcli validation warning

[Richard Hughes <rhughes src gnome org>]

commit e28618363fe26cf7fef6c50b6a9f4cedd008d12f
Author: Richard Hughes <richard hughsie com>
Date:   Tue Jan 8 12:32:05 2019 +0000

    trivial: Fix an appstreamcli validation warning

 data/appdata/org.gnome.Software.appdata.xml.in | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/data/appdata/org.gnome.Software.appdata.xml.in b/data/appdata/org.gnome.Software.appdata.xml.in
index 788d8a92..eb5f3614 100644
--- a/data/appdata/org.gnome.Software.appdata.xml.in
+++ b/data/appdata/org.gnome.Software.appdata.xml.in
@@ -1189,7 +1189,6 @@
   </kudos>
   <url type="bugtracker">https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-software</url>
   <url type="donation">http://www.gnome.org/friends/</url>
-  <url type="help"/>
   <url type="homepage">https://wiki.gnome.org/Design/Apps/Software</url>
   <url type="translate">https://wiki.gnome.org/TranslationProject</url>
   <update_contact>richard_at_hughsie.com</update_contact>