org-habit: Update copyright year

lisp/org-habit.el

@@ -1,6 +1,6 @@
 ;;; org-habit.el --- The habit tracking code for Org-mode
 
-;; Copyright (C) 2009-2014 Free Software Foundation, Inc.
+;; Copyright (C) 2009-2015 Free Software Foundation, Inc.
 
 ;; Author: John Wiegley <johnw at gnu dot org>
 ;; Keywords: outlines, hypermedia, calendar, wp