Removed useless package + management of a failed response

Author: sebprt

composer.json

@@ -22,7 +22,6 @@
         "psr/log": "^1.0",
         "nyholm/psr7": "^1.5",
         "php-etl/bucket": "^0.2.0",
-        "php-http/guzzle7-adapter": "^1.0",
         "php-etl/magento2-api-client": "^0.1.0"
     },
     "minimum-stability": "dev",