[meld] bin/meld: Update required GTK+, etc. versions (#167)

[Kai Willadsen <kaiw src gnome org>]

commit 74a47ba26293724ffdfdf8f913954c2fd2dfc621
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Mon Feb 26 19:05:39 2018 +1000

    bin/meld: Update required GTK+, etc. versions (#167)

 bin/meld | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/bin/meld b/bin/meld
index 12b366d1..cc27bbef 100755
--- a/bin/meld
+++ b/bin/meld
@@ -175,9 +175,9 @@ def show_error_and_exit(error_text):
 
 def check_requirements():
 
-    gtk_requirement = (3, 14)
+    gtk_requirement = (3, 20)
     glib_requirement = (2, 36, 0)
-    gtksourceview_requirement = (3, 14, 0)
+    gtksourceview_requirement = (3, 20, 0)
     pangocairo_requirement = (1, 34)
 
     def missing_reqs(mod, ver, exception=None):