Using correct PHPUnit version

Author: matthew-inamdar

composer.json

@@ -22,14 +22,14 @@
       }
     },
     "require": {
-        "php": ">=7.1.0",
+        "php": "^7.1.3",
         "laravel/framework": "~5.8.0"
     },
     "require-dev": {
         "ext-pdo": "*",
         "friendsofphp/php-cs-fixer": "^2.15",
-        "orchestra/testbench": "^3.5",
-        "phpunit/phpunit": "^8.2"
+        "orchestra/testbench": "~3.8.0",
+        "phpunit/phpunit": "~7.5"
     },
     "config": {
         "sort-packages": true