Remove sensiolabs integration

It does not integrates well with extension required version so unless sensiolabs will ever support docker images, there is no big reason to use it in this case.

Author: pinepain

.sensiolabs.yml

@@ -2,7 +2,6 @@
 
 [![Build Status](https://travis-ci.org/pinepain/php-object-maps.svg?branch=master)](https://travis-ci.org/pinepain/php-object-maps)
 [![Code Coverage](https://scrutinizer-ci.com/g/pinepain/php-object-maps/badges/coverage.png?b=refactor)](https://scrutinizer-ci.com/g/pinepain/php-object-maps/?branch=refactor)
-[![SensioLabsInsight](https://insight.sensiolabs.com/projects/72be40cb-1d0f-48db-b89c-c99ea007bf63/mini.png)](https://insight.sensiolabs.com/projects/72be40cb-1d0f-48db-b89c-c99ea007bf63)
 
 ### PLEASE READ: