[fractal/wip/jtojnar/meson-spdx] meson: Clarify license

[Jan Tojnar <jtojnar src gnome org>]

commit 4125df17745a164503f3560cbc62d81a7d6140f8
Author: Jan Tojnar <jtojnar gmail com>
Date:   Sun Mar 14 16:06:38 2021 +0000

    meson: Clarify license
    
    SPDX is the standard recommended by Meson.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index e518b815..32b51b16 100644
--- a/meson.build
+++ b/meson.build
@@ -1,7 +1,7 @@
 project(
   'fractal', 'rust',
   version: '4.4.0',
-  license: 'GPLv3',
+  license: 'GPL-3.0-or-later',
 )
 
 dependency('openssl', version: '>= 1.0')