Remove coveralls icon

README.md

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 Component providing several adapters to decompress files.
 
 [![Build Status](https://travis-ci.org/piwik/component-decompress.svg?branch=master)](https://travis-ci.org/piwik/component-decompress)
-[![Coverage Status](https://coveralls.io/repos/piwik/component-decompress/badge.png?branch=master)](https://coveralls.io/r/piwik/component-decompress?branch=master)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/piwik/component-decompress/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/piwik/component-decompress/?branch=master)
 
 It supports the following compression formats: