docs+build: Prepare release of version 0.4.0

Change-Id: I3af73fed66b44d708532bbda146376b7f7487d28
Refs: #3008
diff --git a/wscript b/wscript
index 4b0ca05..cef5b2d 100644
--- a/wscript
+++ b/wscript
@@ -24,7 +24,7 @@
 NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 """
 
-VERSION = "0.3.92"
+VERSION = "0.4.0"
 APPNAME = "nfd"
 BUGREPORT = "http://redmine.named-data.net/projects/nfd"
 URL = "http://named-data.net/doc/NFD/"