redmine

Removed coveralls badge

`coveralls` doesn't allow to configure thresholds. And the default thresholds doesn't appropriate for this project (due to a lot of mutually exclusive code).

Related: https://github.com/lemurheavy/coveralls-public/issues/329
[![Build Status](https://travis-ci.org/xaionaro/clsync.png?branch=master)](https://travis-ci.org/xaionaro/clsync)
[![Coverage Status](https://coveralls.io/repos/xaionaro/clsync/badge.png)](https://coveralls.io/r/xaionaro/clsync)
[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/xaionaro/clsync?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
clsync
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