Added Laravel 8 Support

Author: unicodeveloper

composer.json

@@ -14,7 +14,7 @@
     "keywords": ["Laravel", "cloudinary-laravel", "File Uploads", "Media Management", "Cloudinary", "File Transformations"],
     "require": {
         "php": "^7.0",
-        "illuminate/support": "~5|~6|~7",
+        "illuminate/support": "~6|~7|~8",
         "cloudinary/cloudinary_php": "2.0.0-beta6",
         "ext-json": "*"
     },