Композитор требует guzzehttp/guzzle
To install guzzlehttp
composer require guzzlehttp/guzzle
Ref : https://packagist.org/packages/guzzlehttp/guzzle
Gentle Gemsbok
To install guzzlehttp
composer require guzzlehttp/guzzle
Ref : https://packagist.org/packages/guzzlehttp/guzzle