Prepare for 0.6.1 release

Change-Id: Iaf148b70c3e30a0cd6737239a769d54c24e43a80
Refs: #4497
diff --git a/docs/release-notes/release-notes-0.6.1.rst b/docs/release-notes/release-notes-0.6.1.rst
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+ndn-cxx version 0.6.1
+---------------------
+
+Release date: February 19, 2018
+
+New features:
+^^^^^^^^^^^^^
+
+- (potentially breaking change) :ndn-cxx:`expressInterest` now by default loopbacks Interests to
+  producer callbacks on the same :ndn-cxx:`Face`.  When undesired, use
+  ``InterestFilter::allowLoopback(false)`` (:issue:`3979`)
+
+- New signal in :ndn-cxx:`SegmentFetcher` to notify retrieval of Data segments
+  (:issue:`4438`)
+
+- Initial support for the Content Store management protocol
+  (:issue:`4050`)
+
+- Literal operators for ``time::duration`` types, such as ``1_s``, ``42_ms``, ``30_days``
+  (:issue:`4468`)
+
+- Support for BLAKE2 hash function (requires OpenSSL >= 1.1.0)
+
+- A ``escape()`` helper function complementing the existing ``unescape()`` (:issue:`4484`)
+
+Improvements and bug fixes
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+- ``ndnsec key-gen`` command line now allows customization of key ID (:issue:`4294`)
+
+- Fixed encoding of ``'~'`` and ``'+'`` in :ndn-cxx:`Component::toUri()`
+  (:issue:`4484`)
+
+- Fixed handling of large dates when converting to/from string
+  (:issue:`4478`, :issue:`3915`)
+
+- Fixed error handling in :ndn-cxx:`KeyChain::importSafeBag()`
+  (:issue:`4359`)
+
+- Fixed parsing of IPv6 addresses with scope-id
+  (:issue:`4474`)
+
+- :ndn-cxx:`io::load()` now handles empty files properly
+  (:issue:`4434`)
+
+- Switched to using `boost::asio::basic_waitable_timer`
+  (:issue:`4431`)
+
+- Allow linking multiple :ndn-cxx:`DummyClientFace` instances together to emulate a broadcast medium
+  (:issue:`3913`)
+
+- Fixed build when ``std::to_string`` is not available
+  (:issue:`4393`)
+
+- Avoid undefined behavior when casting to :ndn-cxx:`tlv::SignatureTypeValue`
+  (:issue:`4370`)
+
+- Fixed compilation with Boost 1.66.0
+  (:issue:`4422`)
+
+- Various documentation updates
+  (:issue:`3918`, :issue: `4184`, :issue: `4275`)
+
+Removed
+^^^^^^^
+
+- Removed obsolete TLV-TYPE constants
+  (:issue:`4055`, :issue:`3098`, :issue: `3755`)
+