[gnome-software] trivial: Bump minimum required meson version

[Kalev Lember <klember src gnome org>]

commit e015aa61499258b905257320aee4729f22f8970e
Author: Kalev Lember <klember redhat com>
Date:   Thu Sep 20 12:11:34 2018 +0200

    trivial: Bump minimum required meson version
    
    Fixes meson warning:
    
    WARNING: Project targetting '>=0.37.0' but tried to use feature
    introduced in '0.40.0': build_by_default arg in custom_target

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 603ffa6b..c3add9d3 100644
--- a/meson.build
+++ b/meson.build
@@ -2,7 +2,7 @@ project('gnome-software', 'c',
   version : '3.29.2',
   license : 'GPL-2.0+',
   default_options : ['warning_level=1', 'c_std=c99'],
-  meson_version : '>=0.37.0'
+  meson_version : '>=0.40.0'
 )
 
 conf = configuration_data()