Define URL and some keywords/tags for haskell-mode

This way, haskell-mode shows up in `M-x package-list-packages`  when
filtering by the `haskell` tag

Author: hvr

haskell-mode-pkg.el

@@ -1,5 +1,7 @@
 (define-package "haskell-mode" "13.17-git" "A Haskell editing mode"
-		'((cl-lib "0.5")))
+  '((cl-lib "0.5"))
+  :url "https://github.com/haskell/haskell-mode"
+  :keywords '("haskell" "cabal" "ghc" "repl"))
 ;; Local Variables:
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