docs: Prepare version 0.2.2 release notes

Change-Id: I72a1847e7c20d9bac3d85b2263b974ddbcee3431
diff --git a/docs/RELEASE-NOTES.rst b/docs/RELEASE-NOTES.rst
index f0f87dd..98d60cb 100644
--- a/docs/RELEASE-NOTES.rst
+++ b/docs/RELEASE-NOTES.rst
@@ -1,6 +1,15 @@
 Release Notes
 =============
 
+NLSR version 0.2.2 (changes since version 0.2.1)
+++++++++++++++++++++++++++++++++++++++++++++++++
+
+Release date: January 5, 2016
+
+**Code changes**:
+
+- Adapt code to changes in NFD/ndn-cxx version 0.4.0 release
+
 NLSR version 0.2.1 (changes since version 0.2.0)
 ++++++++++++++++++++++++++++++++++++++++++++++++