docs: Prepare release 0.5.1

Change-Id: I377269e4f510b720a4ab11e480c1d0551a32b56e
Refs: #3859
diff --git a/wscript b/wscript
index 5be7c65..d410b4d 100644
--- a/wscript
+++ b/wscript
@@ -3,7 +3,7 @@
 from waflib import Logs, Utils, Context
 import os
 
-VERSION = "0.5.0"
+VERSION = "0.5.1"
 APPNAME = "ndn-cxx"
 PACKAGE_BUGREPORT = "https://redmine.named-data.net/projects/ndn-cxx"
 PACKAGE_URL = "http://named-data.net/doc/ndn-cxx/"