[retro-gtk/meson] meson: Bump required version to 0.50.0

[Adrien Plazas <aplazas src gnome org>]

commit 99c3965f7b5c272ebe578303a857c55e99f57897
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sat Jan 11 08:49:05 2020 +0100

    meson: Bump required version to 0.50.0
    
    This is required to use the 'install' arg in 'configure_file', and fixes
    a build-time warning.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 87f9765..da4c4d2 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project('retro-gtk','c',
   version: '0.18.0',
-  meson_version: '>= 0.43.0',
+  meson_version: '>= 0.50.0',
 )
 
 retro_gtk_prefix = get_option('prefix')