fix composer require

Author: sanchescom

composer.json

@@ -26,9 +26,9 @@
     },
     "require": {
         "php": "^7.2",
-        "laravel/framework": "^5.8.*",
+        "laravel/framework": "5.8.*",
         "jenssegers/model": "^1.2",
-        "sanchescom/json-helper": "^0.1.*",
+        "sanchescom/json-helper": "0.1.*",
         "guzzlehttp/guzzle": "^6.3"
     },
     "require-dev": {