Prepare release 0.6.6

Change-Id: I2896cf769547e7afbedcc4f00bf28b48e0729426
Refs: #4916
diff --git a/docs/releases.rst b/docs/releases.rst
index 45d9377..2573180 100644
--- a/docs/releases.rst
+++ b/docs/releases.rst
@@ -5,6 +5,7 @@
    :hidden:
    :maxdepth: 1
 
+   release-notes/release-notes-0.6.6
    release-notes/release-notes-0.6.5
    release-notes/release-notes-0.6.3
    release-notes/release-notes-0.6.2
@@ -22,6 +23,12 @@
    release-notes/release-notes-0.2.0
    release-notes/release-notes-0.1.0
 
+* **ndn-cxx version 0.6.6**
+  (:doc:`Release Notes <release-notes/release-notes-0.6.6>`, `Documentation <https://named-data.net/doc/ndn-cxx/0.6.6/>`__)
+
+  `src (git) <https://github.com/named-data/ndn-cxx/releases/tag/ndn-cxx-0.6.6>`__,
+  `src (tarball) <https://named-data.net/downloads/nfd-0.6.6.tar.bz2>`__ (`checksum <https://named-data.net/downloads/nfd-0.6.6.tar.bz2.sha256>`__)
+
 * **ndn-cxx version 0.6.5**
   (:doc:`Release Notes <release-notes/release-notes-0.6.5>`, `Documentation <https://named-data.net/doc/ndn-cxx/0.6.5/>`__)