Fixed phpunit dependency 🎊

Author: grimzy

composer.json

@@ -16,7 +16,7 @@
         "jmikola/geojson": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~5.7",
+        "phpunit/phpunit": "~4.8||~5.7",
         "mockery/mockery": "^0.9.9",
         "laravel/laravel": "^5.2",
         "codeclimate/php-test-reporter": "dev-master",