Update to beta3 of cloudinary php sdk and add support for php 7

Author: unicodeveloper

composer.json

@@ -12,8 +12,9 @@
     "homepage": "https://github.com/unicodeveloper/laravel-cloudinary",
     "keywords": ["Laravel", "laravel-cloudinary"],
     "require": {
+        "php": "^7.0",
         "illuminate/support": "~5|~6|~7",
-        "cloudinary/cloudinary_php": "2.0.0-beta"
+        "cloudinary/cloudinary_php": "2.0.0-beta3"
     },
     "require-dev": {
         "phpunit/phpunit": "^8.0",