README.md: Line wrapping and reference-style links

This makes the README easier to read in a terminal or editor, while
leaving the Markdown output unchanged.

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 Software Carpentry Boot Camps
 =============================
 
-This repository contains material useful when preparing and running a boot camp. This can include lecture notes, lesson plans, IPython Notebooks, exercises, and some types of presentations. Please see the [contributor guidelines](https://github.com/swcarpentry/boot-camps/blob/master/CONTRIBUTING.md) for more information on preferred file formats and other instructions for contributing.
+This repository contains material useful when preparing and running a
+boot camp. This can include lecture notes, lesson plans, IPython
+Notebooks, exercises, and some types of presentations. Please see the
+[contributor guidelines][contrib] for more information on preferred
+file formats and other instructions for contributing.
 
-This repository is also used to store material specific to boot camps. Refer to the [wiki](https://github.com/swcarpentry/boot-camps/wiki) for instructions on making your own boot camp branch and/or making a boot camp website.
+This repository is also used to store material specific to boot
+camps. Refer to the [wiki][] for instructions on making your own boot
+camp branch and/or making a boot camp website.
+
+[contrib]: https://github.com/swcarpentry/boot-camps/blob/master/CONTRIBUTING.md
+[wiki]: https://github.com/swcarpentry/boot-camps/wiki