Fix #6 - "guzzlehttp/guzzle" 7 support

Author: williamdes

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 - Support laravel 8
 - Support `illuminate/support` 8
+- Support `guzzlehttp/guzzle` 7
 - Add support for setDirectBootOk on OptionsBuilder
 - Mark setDryRun as deprecated v1 FCM on OptionsBuilder
 

composer.json

@@ -17,7 +17,7 @@
     "require": {
         "php": ">=5.5.9",
         "illuminate/support": "5.* || ^6 || ^7 || ^8",
-        "guzzlehttp/guzzle": "~6.0",
+        "guzzlehttp/guzzle": "^6 || ^7",
         "monolog/monolog": "^1.12|^2.0"
     },
     "require-dev": {