docs: Prepare version 0.4.0 release notes

Split the long release notes similar to NFD

Change-Id: If5ce5247bf74a4e402a33d92a35a686e7193dea1
diff --git a/wscript b/wscript
index f599297..96f2980 100644
--- a/wscript
+++ b/wscript
@@ -20,7 +20,7 @@
 NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 """
 
-VERSION = "0.3.2"
+VERSION = "0.4.0"
 APPNAME = "nlsr"
 BUGREPORT = "https://redmine.named-data.net/projects/nlsr"
 URL = "https://named-data.net/doc/NLSR/"