Update README.md

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README.md

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 [![Build Status](https://travis-ci.org/Tanganelli/CoAPthon.svg?branch=master)](https://travis-ci.org/Tanganelli/CoAPthon)
 [![Coverage Status](https://coveralls.io/repos/Tanganelli/CoAPthon/badge.svg?branch=master&service=github)](https://coveralls.io/github/Tanganelli/CoAPthon?branch=master)
 [![Documentation Status](https://readthedocs.org/projects/coapthon/badge/?version=latest)](http://coapthon.readthedocs.org/en/latest/?badge=latest)
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 CoAPthon
 ========
@@ -407,3 +408,4 @@ $ make html
 ```
 
 The documentation will be build in CoAPthon/docs/build/html. Let's start from index.html to have an overview of the library.
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