Prepare release 0.4.0

Change-Id: Iec6b0ccd266f34605b0b3ad4ae95250049745953
diff --git a/wscript b/wscript
index 9fcb8b3..5fe386f 100644
--- a/wscript
+++ b/wscript
@@ -3,7 +3,7 @@
 from waflib import Logs, Utils, Context
 import os
 
-VERSION = '0.3.0'
+VERSION = '0.4.0'
 APPNAME = 'ChronoSync'
 
 def options(opt):