docs: Adding release notes and bumping up version to 0.2.0

Change-Id: I0106c225a54fe09318d4a391c96626a8b06ceb2b
Refs: #1715
diff --git a/wscript b/wscript
index ef522e9..0f168b7 100644
--- a/wscript
+++ b/wscript
@@ -3,7 +3,7 @@
 from waflib import Logs, Utils, Context
 import os
 
-VERSION = "0.1.0"
+VERSION = "0.2.0"
 APPNAME = "ndn-cxx"
 PACKAGE_BUGREPORT = "http://redmine.named-data.net/projects/ndn-cxx"
 PACKAGE_URL = "http://named-data.net/doc/ndn-cxx/"