added badges

Author: pwrose

README.md

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 # Ten Simple Rules for Reproducible Research in Jupyter Notebooks
-https://travis-ci.com/jupyter-guide/ten-rules-jupyter.svg?branch=master
+[![Build Status](https://api.travis-ci.com/jupyter-guide/ten-rules-jupyter.svg?branch=master)](https://www.travis-ci.org/jupyter-guide/ten-rules-jupyter)
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 This repository is a supplement to the "Ten Simple Rules for Reproducible Research in Jupyter Notebook" paper [ref].