Add badges to README

README.md

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 Data Science at the Command Line
 ================================
 
-<img src="http://datascienceatthecommandline.com/images/cover.png" width="349px" style="border: 1px solid black;" />
-
-This repository contains the full text, data, scripts, and custom command-line tools used in the book [Data Science at the Command Line](http://datascienceatthecommandline.com). The book is licensed under the Creative Commons Attribution-NoDerivatives 4.0 International License.
+[![Build Status](https://travis-ci.org/jeroenjanssens/data-science-at-the-command-line.svg?branch=master)](https://travis-ci.org/jeroenjanssens/data-science-at-the-command-line)
+[![License: CC BY-ND 4.0](https://img.shields.io/badge/License-CC%20BY--ND%204.0-lightgrey.svg)](https://creativecommons.org/licenses/by-nd/4.0/)
+[![License](https://img.shields.io/badge/License-BSD%202--Clause-orange.svg)](https://opensource.org/licenses/BSD-2-Clause)
 
-## License
+<img src="http://datascienceatthecommandline.com/images/cover.png" width="349px" style="border: 1px solid black;" />
 
-BSD 2-Clause
+This repository contains the full text, data, scripts, and custom command-line tools used in the book [Data Science at the Command Line](http://datascienceatthecommandline.com). The book is licensed under the Creative Commons Attribution-NoDerivatives 4.0 International License. The command-line tools are licensed under the BSD 2-Clause License.