doc: suggest cabal installing alex & happy also
These tools are needed for some deps, eg pretty-show and language-javascript, and may not have already been installed. Mentioning them explicitly may reduce a some installation hassles.
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				| @ -73,6 +73,7 @@ Use cabal | ||||
| 
 | ||||
| ## I want to build the [latest release](release-notes.html) with [GHC](http://haskell.org/ghc) and [cabal](http://haskell.org/cabal/download.html) | ||||
| 
 | ||||
| `cabal install alex happy`    (if you don't already have these in your path)\ | ||||
| `cabal sandbox init; cabal update; cabal install hledger-web`\ | ||||
| <!-- [cabal install guide](cabal-install.html) --> | ||||
| 
 | ||||
| @ -82,5 +83,6 @@ The [Installation Guide](installing.html) describes how to install using cabal i | ||||
| 
 | ||||
| ## I want to build the [latest development code](http://hledger.org/code) | ||||
| 
 | ||||
| `cabal install alex happy`    (if you don't already have these in your path)\ | ||||
| `git clone https://github.com/simonmichael/hledger; cd hledger; make sandbox install` | ||||
| 
 | ||||
|  | ||||
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