Prepare release 0.6.6

Refs: #4916
Change-Id: I1134244b58f14afa32c21dd8270103693cea4e84
diff --git a/docs/releases.rst b/docs/releases.rst
index 7688c02..a83ed73 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-0.6.4
    release-notes/release-notes-0.6.3
@@ -23,6 +24,12 @@
    release-notes/release-notes-0.2.0
    release-notes/release-notes-0.1.0
 
+* **NFD version 0.6.6**
+  (:doc:`Release Notes <release-notes/release-notes-0.6.6>`, `Documentation <https://named-data.net/doc/NFD/0.6.6/>`__)
+
+  `src (git) <https://github.com/named-data/NFD/releases/tag/NFD-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>`__)
+
 * **NFD version 0.6.5**
   (:doc:`Release Notes <release-notes/release-notes-0.6.5>`, `Documentation <https://named-data.net/doc/NFD/0.6.5/>`__)