Update README.md

README.md

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 A script to install basic development tools for io.js - the new node.js - git, iojs, gcc, pkg-config, etc
 
-* [Instructions for OS X](#apple-os-x)
+Pick one:
-* [Instructions for Ubuntu Linux](#ubuntu-linux)
+
-* [Instructions for TL;DR](#tldr)
+* [OS X](#apple-os-x)
+* [Ubuntu Linux](#ubuntu-linux)
+* [TL;DR](#tldr)
 * [Important Notes](#other-things-you-should-know)
 
 ## Screencast