Prepare release 0.5.1

Change-Id: I6355c350822fa5de1f68db6d205ca2ba4044b0dc
diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index bc26a47..cef5a82 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,6 +1,15 @@
 Release Notes
 =============
 
+## Version 0.5.1
+
+- Fix forceful shutdown of `Face` when destructing `Logic` instance
+  (Issue #4525)
+
+- Fix compilation against the latest version of ndn-cxx library
+
+- Upgrade `waf` to the latest version and other improvements
+
 ## Version 0.5.0
 
 - **Breaking change** Use bzip2 compression of sync Data payload (Issue #4140)
diff --git a/wscript b/wscript
index 82aafb6..fa2864b 100644
--- a/wscript
+++ b/wscript
@@ -1,6 +1,6 @@
 # -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-
 
-VERSION = '0.5.0'
+VERSION = '0.5.1'
 APPNAME = 'ChronoSync'
 GIT_TAG_PREFIX = ''