docs+build: Prepare release of version 0.4.0

Change-Id: Ie5dfb3a1c7674cd426b89721c91ad59327517764
Refs: #3178
diff --git a/wscript b/wscript
index b13263b..160da33 100644
--- a/wscript
+++ b/wscript
@@ -3,7 +3,7 @@
 from waflib import Logs, Utils, Context
 import os
 
-VERSION = "0.3.4"
+VERSION = "0.3.91"
 APPNAME = "ndn-cxx"
 PACKAGE_BUGREPORT = "http://redmine.named-data.net/projects/ndn-cxx"
 PACKAGE_URL = "http://named-data.net/doc/ndn-cxx/"