[releng] Make libschedule.py use 3.20 instead of 3.18

[Andre Klapper <aklapper src gnome org>]

commit 7d5f8731e8d8b8aea90f936d5ee3859a32a20a85
Author: Andre Klapper <a9016009 gmx de>
Date:   Thu Oct 15 10:22:04 2015 +0200

    Make libschedule.py use 3.20 instead of 3.18

 tools/schedule/libschedule.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tools/schedule/libschedule.py b/tools/schedule/libschedule.py
index 94f506b..2e0cc46 100755
--- a/tools/schedule/libschedule.py
+++ b/tools/schedule/libschedule.py
@@ -8,7 +8,7 @@ import os
 import os.path
 import sys
 
-DEFAULT_SCHEDULE='3.18.schedule'
+DEFAULT_SCHEDULE='3.20.schedule'
 
 class GnomeReleaseEvent:
     definitions = {}