Include link to one-line haskell vim installer

It installs all necessary helpers like ghc-mod etc and configures vim.

README.md

@@ -196,6 +196,8 @@ Useful for understanding `Functor`, `Applicative`, `Monad`, `Monoid` and other t
 ### Vim
 
 - http://www.haskell.org/haskellwiki/Vim
+ 
+- https://github.com/begriffs/haskell-vim-now
 
 - http://www.stephendiehl.com/posts/vim_haskell.html