Prepare release 0.7.0

Change-Id: I3d707d1f1684879fa9133ac87d1b53710465dea1
diff --git a/wscript b/wscript
index 6beff79..bcf3261 100644
--- a/wscript
+++ b/wscript
@@ -22,7 +22,7 @@
 from waflib import Context, Logs, Utils
 import os, subprocess
 
-VERSION = '0.6.0'
+VERSION = '0.7.0'
 APPNAME = 'nlsr'
 GIT_TAG_PREFIX = 'NLSR-'