Updated to PHPUnit 7.5

Author: michalbundyra

composer.json

@@ -21,7 +21,7 @@
         "zendframework/zend-stdlib": "^3.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.2",
+        "phpunit/phpunit": "^7.5.2",
         "zendframework/zend-coding-standard": "~1.0.0",
         "zendframework/zend-filter": "^2.8",
         "zendframework/zend-servicemanager": "^3.3"