Add cabal update to install instructions
Before I ran `cabal update` I got this on `cabal install` ``` Config file path source is default config file. Config file ~/.cabal/config not found. Writing default configuration to ~/.cabal/config Warning: The package list for 'hackage.haskell.org' does not exist. Run 'cabal update' to download it. Resolving dependencies... cabal: Could not resolve dependencies: trying: ShellCheck-0.3.2 ```
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@ -39,6 +39,7 @@ On Mac OS X with MacPorts (http://www.macports.org/):
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With cabal installed, cd to the shellcheck source directory and:
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With cabal installed, cd to the shellcheck source directory and:
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$ cabal update
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$ cabal install
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$ cabal install
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...
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...
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$ which shellcheck
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$ which shellcheck
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