docs: Prepare version 0.4.0 release notes

Split the long release notes similar to NFD

Change-Id: If5ce5247bf74a4e402a33d92a35a686e7193dea1
diff --git a/docs/release-notes/release-notes-0.3.2.rst b/docs/release-notes/release-notes-0.3.2.rst
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+NLSR version 0.3.2 (changes since version 0.3.1)
+++++++++++++++++++++++++++++++++++++++++++++++++
+
+Release date: March 15, 2017
+
+**Changes**
+
+- NLSR constructor now accept a KeyChain argument. (:issue:`3742`)
+
+- Fix security rule for /localhop LSA prefix (:issue:`3899`)
+
+- Use ndn::nfd::ROUTE_ORIGIN_NLSR instead of a magic number. (:issue:`3903`)
+
+- Handle "Face Already Exists" error (error code 409) in NFD. (:issue:`3976`)
+
+- Enable NLSR to register localhost prefix with dispatcher before top-level prefix. (:issue:`3938`)
+
+- Don't use ndn aliases provided by ndn-cxx/common.hpp. (:issue:`3983`)
+
+- Remove use of deprecated code. (:issue:`3988`)
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