Link to Headers in Github READMEs

Anytime you add a header to a markdown file, Github attaches an href with its downcased, punctuation-stripped name. 'JavaScript' receives a link to #javascript, for instance.

Spaces become dashes, so 'Command Line' becomes #command-line.

Leverage this by adding a table of contents to your README with links to the headers further down the document:

### Table of Contents

- [Cucumber](#cucumber)

This will link to a header containing 'Cucumber'.

h/t Josh Branchaud

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