remove coveralls in a favor of codecov

.travis.yml

@@ -7,7 +7,7 @@ php:
   - 7.4
 env:
   global:
-    - ES_VERSION=6.2.3 ES_DOWNLOAD_URL=https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-${ES_VERSION}.tar.gz
+    - ES_VERSION=6.8.2 ES_DOWNLOAD_URL=https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-${ES_VERSION}.tar.gz
   matrix:
     - SYMFONY="^4.4"
     - SYMFONY="^5.0"
@@ -28,4 +28,4 @@ script:
   - vendor/bin/phpunit --coverage-clover=coverage.clover
   - vendor/bin/phpcs -p --standard=PSR2 --ignore=vendor/,Tests/app/,var/cache ./
 after_script:
-  - travis_retry php vendor/bin/coveralls
+  - travis_retry bash <(curl -s https://codecov.io/bash)

README.md

@@ -23,6 +23,7 @@ is the preferred and recommended way to ask questions about ONGR bundles and lib
 
 
 [![Build Status](https://travis-ci.org/ongr-io/ElasticsearchBundle.svg?branch=master)](https://travis-ci.org/ongr-io/ElasticsearchBundle)
+[![codecov](https://codecov.io/gh/ongr-io/ElasticsearchBundle/branch/master/graph/badge.svg)](https://codecov.io/gh/ongr-io/ElasticsearchBundle)
 [![Latest Stable Version](https://poser.pugx.org/ongr/elasticsearch-bundle/v/stable)](https://packagist.org/packages/ongr/elasticsearch-bundle)
 [![Total Downloads](https://poser.pugx.org/ongr/elasticsearch-bundle/downloads)](https://packagist.org/packages/ongr/elasticsearch-bundle)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/ongr-io/ElasticsearchBundle/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/ongr-io/ElasticsearchBundle/?branch=master)