Bump Version header ins haskell-mode.el to 13.12.

Author: gracjan

haskell-mode.el

@@ -9,7 +9,7 @@
 ;;          2001-2002 Reuben Thomas (>=v1.4)
 ;;          2003      Dave Love <[email protected]>
 ;; Keywords: faces files Haskell
-;; Version: 13.10
+;; Version: 13.12
 ;; URL: https://github.com/haskell/haskell-mode
 
 ;; This file is not part of GNU Emacs.