docs+build: Prepare release of version 0.4.0

Change-Id: Ibd3129da74afa24a35115789a517e562f0a12639
Refs: #3178
diff --git a/wscript b/wscript
index 151a084..4312413 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 = "0.3.4"
+VERSION = "0.3.91"
 APPNAME = "nfd"
 BUGREPORT = "http://redmine.named-data.net/projects/nfd"
 URL = "http://named-data.net/doc/NFD/"