Prepare release 0.6.6

Refs: #4916
Change-Id: I1134244b58f14afa32c21dd8270103693cea4e84
diff --git a/wscript b/wscript
index 90f7536..ffffd5e 100644
--- a/wscript
+++ b/wscript
@@ -26,7 +26,7 @@
 from waflib import Context, Logs, Utils
 import os, subprocess
 
-VERSION = '0.6.5'
+VERSION = '0.6.6'
 APPNAME = 'nfd'
 BUGREPORT = 'https://redmine.named-data.net/projects/nfd'
 URL = 'https://named-data.net/doc/NFD/'