docs: Prepare release notes for version 0.3.0

Change-Id: I25c1105546ac0c2108225cd578d88bbccec89cfc
Refs: #2463, #2209, #2352
diff --git a/wscript b/wscript
index d4fcb82..ca0e461 100644
--- a/wscript
+++ b/wscript
@@ -3,7 +3,7 @@
 from waflib import Logs, Utils, Context
 import os
 
-VERSION = "0.2.0"
+VERSION = "0.3.0"
 APPNAME = "ndn-cxx"
 PACKAGE_BUGREPORT = "http://redmine.named-data.net/projects/ndn-cxx"
 PACKAGE_URL = "http://named-data.net/doc/ndn-cxx/"