Add Guzzle 7 & Laravel 8 Support.

Author: irazasyed

composer.json

@@ -13,9 +13,9 @@
     ],
     "require": {
         "php": "^7.2",
-        "guzzlehttp/guzzle": "^6.2",
-        "illuminate/notifications": "^5.5 || ^6.0 || ^7.0",
-        "illuminate/support": "^5.5 || ^6.0 || ^7.0"
+        "guzzlehttp/guzzle": "^6.2 || ^7.0",
+        "illuminate/notifications": "^5.5 || ^6.0 || ^7.0 || ^8.0",
+        "illuminate/support": "^5.5 || ^6.0 || ^7.0 || ^8.0"
     },
     "require-dev": {
         "mockery/mockery": "^1.0",