fix compatiblity for laravel 6.*

Author: basemkhirat

composer.json

@@ -40,6 +40,7 @@
     "require": {
         "php": ">=5.6.6",
         "elasticsearch/elasticsearch": "^5.0|^6.0",
+        "laravel/helpers": "1.1.*",
         "illuminate/pagination": "*",
         "illuminate/support": "*",
         "symfony/var-dumper": "*",