Update laravel/framework requirement from ^5.5 || ^6.0 to ^5.5 || ^6.…

…0 || ^7.0

Updates the requirements on [laravel/framework](https://github.com/laravel/framework) to permit the latest version.
- [Release notes](https://github.com/laravel/framework/releases)
- [Changelog](https://github.com/laravel/framework/blob/7.x/CHANGELOG-6.x.md)
- [Commits](https://github.com/laravel/framework/commits/v7.0.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

composer.json

@@ -4,7 +4,7 @@
     "type": "library",
     "require": {
         "guzzlehttp/guzzle": "^6.3",
-        "laravel/framework": "^5.5 || ^6.0",
+        "laravel/framework": "^5.5 || ^6.0 || ^7.0",
         "swiftmailer/swiftmailer": "^6.1"
     },
     "license": "MIT",