Add support for Guzzle 7

Author: paras-malhotra

composer.json

@@ -10,10 +10,10 @@
     ],
     "require": {
         "php": ">=5.5.9",
-        "guzzlehttp/guzzle": "^6.2"
+        "guzzlehttp/guzzle": "^6.2|^7.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~5.0"
+        "phpunit/phpunit": "^5.0|^6.0|^7.0|^8.0|^9.0"
     },
     "autoload": {
         "psr-4": {
@@ -29,7 +29,7 @@
                 "Insense\\LaravelSMS\\Providers\\SMSChannelServiceProvider"
             ],
             "aliases": {
-                "Debugbar": "Insense\\LaravelSMS\\Facades\\SMS"
+                "SMS": "Insense\\LaravelSMS\\Facades\\SMS"
             }
         }
     }