Remove coveralls integration

Author: chadicus

.coveralls.yml

@@ -2,7 +2,6 @@
 
 [![Build Status](https://travis-ci.org/traderinteractive/image-util-php.svg?branch=master)](https://travis-ci.org/traderinteractive/image-util-php)
 [![Code Quality](https://scrutinizer-ci.com/g/traderinteractive/image-util-php/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/traderinteractive/image-util-php/?branch=master)
-[![Coverage Status](https://coveralls.io/repos/github/traderinteractive/image-util-php/badge.svg?branch=master)](https://coveralls.io/github/traderinteractive/image-util-php?branch=master)
 
 [![Latest Stable Version](https://poser.pugx.org/traderinteractive/image-util/v/stable)](https://packagist.org/packages/traderinteractive/image-util)
 [![Latest Unstable Version](https://poser.pugx.org/traderinteractive/image-util/v/unstable)](https://packagist.org/packages/traderinteractive/image-util)

README.md

@@ -29,7 +29,6 @@
         "traderinteractive/util": "^3.0"
     },
     "require-dev": {
-        "php-coveralls/php-coveralls": "^1.0",
         "phpunit/phpunit": "^6.0",
         "squizlabs/php_codesniffer": "^3.2"
     },