Prepare release 0.5.2

Change-Id: If4489a9fcb7f2bdb9c9f2315dca932aa93f847ed
diff --git a/wscript b/wscript
index b672791..4e8b19e 100644
--- a/wscript
+++ b/wscript
@@ -22,7 +22,7 @@
 from waflib import Context, Logs, Utils
 import os, subprocess
 
-VERSION = "0.5.1"
+VERSION = "0.5.2"
 APPNAME = "nlsr"
 BUGREPORT = "https://redmine.named-data.net/projects/nlsr"
 URL = "https://named-data.net/doc/NLSR/"