upgrade laravel

(cherry picked from commit 2357704)

Author: MatanYadaev

composer.json

@@ -18,7 +18,7 @@
     "require-dev": {
         "phpunit/phpunit": "~4.8||~5.7",
         "mockery/mockery": "^0.9.9",
-        "laravel/laravel": "^5.2",
+        "laravel/laravel": "^5.2|^6.0",
         "codeclimate/php-test-reporter": "dev-master",
         "doctrine/dbal": "^2.5",
         "laravel/browser-kit-testing": "^2.0"