PHPUnit version fixing

composer.json

@@ -27,6 +27,7 @@
         "irazasyed/laravel-gamp": "1.3.x",
         "toin0u/geotools-laravel": "1.0.x",
         "spatie/laravel-pjax": "1.3.x",
+        "myclabs/deep-copy": "1.8.x",
         "league/geotools": "0.8.x",
         "fzaninotto/faker": "^1.8",
         "hashids/hashids": "2.0.x",
@@ -49,7 +50,7 @@
         "waavi/sanitizer": "1.0.x"
     },
     "require-dev": {
-        "phpunit/phpunit": "7.2.x",
+        "phpunit/phpunit": "7.5.x",
         "barryvdh/laravel-ide-helper": "^2.0",
         "barryvdh/laravel-debugbar": "^3.0",
         "mockery/mockery": "0.9.*",