docs+build: Prepare release of version 0.4.0 (beta2)

Change-Id: I2847efb35a21214c586a417d5d3ac58f11365908
Refs: #3252
diff --git a/wscript b/wscript
index 160da33..7f69e64 100644
--- a/wscript
+++ b/wscript
@@ -3,7 +3,7 @@
 from waflib import Logs, Utils, Context
 import os
 
-VERSION = "0.3.91"
+VERSION = "0.3.92"
 APPNAME = "ndn-cxx"
 PACKAGE_BUGREPORT = "http://redmine.named-data.net/projects/ndn-cxx"
 PACKAGE_URL = "http://named-data.net/doc/ndn-cxx/"