Prepare release 0.8.0

Change-Id: I4fd006cc7f8f1a672b6cf0ddd422a4653da6d87f
Refs: #5172
diff --git a/wscript b/wscript
index 67cd3a9..ebdf2b3 100644
--- a/wscript
+++ b/wscript
@@ -3,7 +3,7 @@
 from waflib import Context, Logs, Utils
 import os, subprocess
 
-VERSION = '0.7.1'
+VERSION = '0.8.0'
 APPNAME = 'ndn-cxx'
 PACKAGE_BUGREPORT = 'https://redmine.named-data.net/projects/ndn-cxx'
 PACKAGE_URL = 'http://named-data.net/doc/ndn-cxx/'