docs+build: Prepare release of version 0.4.0 (beta2)

Change-Id: I9c9fe4a9f43d31be9e60fd743699f8729d1ccc4c
Refs: #3252
diff --git a/wscript b/wscript
index 4312413..d4e597c 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 = "0.3.91"
+VERSION = "0.3.92"
 APPNAME = "nfd"
 BUGREPORT = "http://redmine.named-data.net/projects/nfd"
 URL = "http://named-data.net/doc/NFD/"