Updated PHPUnit to 6.5.7
Updated PHPUnit to 6.5.7

* sebastian/comparator (2.1.0 => 2.1.3)
* doctrine/instantiator (1.0.5 => 1.1.0)
* phpunit/phpunit-mock-objects (5.0.5 => 5.0.6)
* webmozart/assert (1.2.0 => 1.3.0)
* phpdocumentor/reflection-docblock (4.2.0 => 4.3.0)
* phpspec/prophecy (1.7.3 => 1.7.5)
* phpunit/phpunit (6.5.4 => 6.5.7)

PHPBenelux/opencfp,GrUSP/opencfp,localheinz/opencfp,localheinz/opencfp,PHPBenelux/opencfp,opencfp/opencfp,GrUSP/opencfp,localheinz/opencfp,opencfp/opencfp,PHPBenelux/opencfp,opencfp/opencfp,PHPBenelux/opencfp,GrUSP/opencfp,localheinz/opencfp,GrUSP/opencfp