Update mix.exs version

Christophe Romain · Christophe Romain · commit 0bd4d1aade28 · 2018-04-25T12:30:36.000+02:00
diff --git a/mix.exs b/mix.exs
@@ -3,7 +3,7 @@ defmodule Ejabberd.Mixfile do
 
   def project do
     [app: :ejabberd,
-     version: "18.3.0",
+     version: "18.4.0",
      description: description(),
      elixir: "~> 1.4",
      elixirc_paths: ["lib"],
