docs+build: Prepare release of version 0.4.0

Change-Id: I84b7b2471e0c898229d204a00a2aa0e82c85678e
Refs: #3008
diff --git a/wscript b/wscript
index 7f69e64..ab8b921 100644
--- a/wscript
+++ b/wscript
@@ -3,7 +3,7 @@
 from waflib import Logs, Utils, Context
 import os
 
-VERSION = "0.3.92"
+VERSION = "0.4.0"
 APPNAME = "ndn-cxx"
 PACKAGE_BUGREPORT = "http://redmine.named-data.net/projects/ndn-cxx"
 PACKAGE_URL = "http://named-data.net/doc/ndn-cxx/"