Prepare release 0.5.0

Change-Id: I8ebb2f5779d7da0c0b6c2f11cc9c653e8d3b1d90
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+NLSR version 0.5.0
+++++++++++++++++++
+
+**New Features**
+
+- Set CanBePrefix to false on Hello Interest (:issue:`4581`)
+- Optionally write prefixes to a copy of config file via nlsrc advertise (:issue:`4303`)
+- Use SegmentPublisher utility from PSync to publish LSA data (:issue:`4760`)
+- Add PSync as a dependency and switch it as default in conf file. (:issue:`4082`)
+
+**Changes**
+
+- Decouple classes from Nlsr object for easier unit testing (:issue:`1952`)
+- Set sequence number file in SequencingManager constructor. (:issue:`4288`)
+- Read conf file in test prefix update processor instead of static string (:issue:`3960`)
+- Canonize FaceUri in conf file processor (:issue:`4817`)
+- Remove redundant function "calculateHypDryRoutingTable" (:issue:`4811`)
+- In dry run mode, print HR and LS routing table in nlsrc separately (:issue:`4452`)
+- Fix ASan memory leaks in unit tests (:issue:`4682`)
+- Systemd service files dependency corrections for Ubuntu 18.04 (:issue:`4594`)
+
+**Bug Fixes**
+
+- Fix processing of interest w/ segments for segmented LSA data (:issue:`4784`)
+- Fib: don't refresh neighbor router's FIB entry (:issue:`4799`)
+- Disable Interest filter loopback where ever not needed (:issue:`4768`)
+- Avoid crash when ndn-cxx is compiled with tests by setting canBePrefix (:issue:`4691`)
+- Make sure NLSR is not using any deprecated API (:issue:`4679`)
+- Fix crash in equals operator of adjacency-list (:issue:`4705`)
+- Fix error handling and normalize exit codes
+
+**Miscellaneous**
+
+- Improving documentation for NLSR
+- A beginners' guide to installing and testing on Fedora