Clean README

Author: martinRenou

README.md

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 # ipycanvas
 
-[![Build Status](https://travis-ci.org/martinRenou/ipycanvas.svg?branch=master)](https://travis-ci.org/martinRenou/ipycanvas)
-[![codecov](https://codecov.io/gh/martinRenou/ipycanvas/branch/master/graph/badge.svg)](https://codecov.io/gh/martinRenou/ipycanvas)
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 Interactive widgets library exposing the browser's Canvas API
 
 ## Installation