[babl] meson: depend on meson 0.50.0

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 77abfe4b2da03db37f878aabbfe4e652d43964c4
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Aug 8 10:54:54 2019 +0200

    meson: depend on meson 0.50.0

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index e2a2064bf..c38c71553 100644
--- a/meson.build
+++ b/meson.build
@@ -1,7 +1,7 @@
 project('babl', 'c',
   license: 'LGPL3+',
   version: '0.1.71',
-  meson_version: '>=0.49.0',
+  meson_version: '>=0.50.0',
   default_options: [
     'sysconfdir=/etc',
     'localstatedir=/var',