docs: Prepare version 0.4.1 release notes

Change-Id: I91db5b65dfe06187ddb0e9df32905dc2c8797ddc
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+NLSR version 0.4.1
+++++++++++++++++++
+
+**New features**:
+
+- The routing table dataset publisher (:issue:`3630`)
+
+- Use ndn-cxx logging facility, remove log4cxx dependency (:issue:`3949`)
+
+- Automatic serving of other routers' certificates (:issue:`4448`)
+
+**Bug Fixes**:
+
+- Hard-code a fixed session name for ChronoSync sockets (:issue:`4513`)
+
+- Fix encoding bug in the routing table publisher (:issue:`4453`)
+
+- Fix NLSR not converging without content store (:issue:`4430`)
+
+**Miscellaneous Changes**:
+
+- Make ChronoSync's sync interest lifetime configurable (:issue:`4490`)
+
+- Print labels on adjacency matrix when logging (:issue:`2045`)
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