[rel] version 0.4.0

Author: Guillaume Bour

apps/letsencrypt/src/letsencrypt.app.src

@@ -1,6 +1,6 @@
 {application, 'letsencrypt',
  [{description, "letsencrypt.org client library"},
-  {vsn, "0.3.0"},
+  {vsn, "0.4.0"},
   {registered, []},
   {applications,
    [kernel,