[gnome-software] trivial: Fix up example spec file

[Richard Hughes <rhughes src gnome org>]

commit 115867edbf26faf617a94126967247269fbaa5e4
Author: Richard Hughes <richard hughsie com>
Date:   Mon Feb 15 09:03:26 2016 +0000

    trivial: Fix up example spec file

 contrib/gnome-software.spec.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/contrib/gnome-software.spec.in b/contrib/gnome-software.spec.in
index 2b16f76..77f3092 100644
--- a/contrib/gnome-software.spec.in
+++ b/contrib/gnome-software.spec.in
@@ -31,6 +31,7 @@ BuildRequires: gnome-desktop3-devel
 BuildRequires: gsettings-desktop-schemas-devel
 BuildRequires: libappstream-glib-devel
 BuildRequires: fwupd-devel
+BuildRequires: json-glib-devel
 
 # this is not a library version
 %define gs_plugin_version               8