Added coverage badge (#706)

* Added coverage badge

* Added missing argument

Author: Nyholm

.travis.yml

@@ -10,4 +10,5 @@ script:
     - composer test-ci
 
 after_success:
-    - wget https://scrutinizer-ci.com/ocular.phar; php ocular.phar code-coverage:upload --format=php-clover
+    - wget https://scrutinizer-ci.com/ocular.phar
+    - php ocular.phar code-coverage:upload --format=php-clover build/coverage.xml

Readme.md

@@ -3,6 +3,7 @@
 [![Latest Stable Version](https://poser.pugx.org/willdurand/geocoder/v/stable)](https://packagist.org/packages/willdurand/geocoder)
 [![Total Downloads](https://poser.pugx.org/willdurand/geocoder/downloads)](https://packagist.org/packages/willdurand/geocoder)
 [![Monthly Downloads](https://poser.pugx.org/willdurand/geocoder/d/monthly.png)](https://packagist.org/packages/willdurand/geocoder)
+[![Code Coverage](https://img.shields.io/scrutinizer/coverage/g/geocoder-php/php-common.svg?style=flat-square)](https://scrutinizer-ci.com/g/geocoder-php/php-common)
 [![Quality Score](https://img.shields.io/scrutinizer/g/geocoder-php/php-common.svg?style=flat-square)](https://scrutinizer-ci.com/g/geocoder-php/php-common)
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE)