[meld] Fix our Meson gtksourceview requirement

[Kai Willadsen <kaiw src gnome org>]

commit cfddbced28c1f7c1fbceb75e2f35a7af2b1f2eae
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sat Sep 21 12:11:22 2019 +1000

    Fix our Meson gtksourceview requirement

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 352844b6..4d9ad399 100644
--- a/meson.build
+++ b/meson.build
@@ -17,7 +17,7 @@ endif
 
 dependency('gtk+-3.0', version: '>= 3.20')
 dependency('glib-2.0', version: '>= 2.48')
-dependency('gtksourceview-3.0', version: '>= 3.20.0')
+dependency('gtksourceview-4', version: '>= 4.0.0')
 
 prefix = get_option('prefix')