fix(Coveralls.io): fixing coveralls configuration

Author: andreasonny83

.coveralls.yml

@@ -0,0 +1 @@
+repo_token: zcGN71w8DuEyxIdNScoopTtU5TpJ4z42I

README.md

@@ -1,5 +1,6 @@
 [![Build Status](https://travis-ci.org/andreasonny83/angular2-expandable-list.svg?branch=master)](https://travis-ci.org/andreasonny83/angular2-expandable-list)
 [![npm version](https://badge.fury.io/js/angular2-expandable-list.svg)](https://badge.fury.io/js/angular2-expandable-list)
+[![Coverage Status](https://coveralls.io/repos/github/andreasonny83/angular2-expandable-list/badge.svg?branch=master)](https://coveralls.io/github/andreasonny83/angular2-expandable-list?branch=master)
 [![npm](https://img.shields.io/npm/dm/angular2-expandable-list.svg)](https://www.npmjs.com/package/angular2-expandable-list)
 [![Commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)