Merge branch 'master' of github.com:koalaman/shellcheck

README

@@ -30,6 +30,9 @@ For older releases, you may have to use:
 On Mac OS X with homebrew (http://brew.sh/), use:
   brew install cabal-install
 
+On Mac OS X with MacPorts (http://www.macports.org/), use:
+  port install hs-cabal-install
+
 Executables can be built with cabal. Tests currently still rely on a Makefile.
 
 Install: