org.el: Update Version and Package-Requires header

lisp/org.el

@@ -6,9 +6,9 @@
 ;; Author: Carsten Dominik <carsten at orgmode dot org>
 ;; Maintainer: Bastien Guerry <bzg at gnu dot org>
 ;; URL: http://orgmode.org
-;; Version: 8.3.1
+;; Version: 8.4-git
 ;; Keywords: outlines, hypermedia, calendar, wp
-;; Package-Requires: ((emacs "23.2"))
+;; Package-Requires: ((emacs "24.3"))
 ;;
 ;; This file is part of GNU Emacs.
 ;;