Package guzzle/guzzle is abandoned, you should avoid using it. Use guzzlehttp/guzzle instead.

Package operations: 2 installs, 0 updates, 0 removals
  - Installing guzzle/guzzle (v3.8.1): Downloading (100%)         
  - Installing qcloud/cos-sdk-v5 (v1.2.3): Downloading (100%)         
**Package guzzle/guzzle is abandoned, you should avoid using it. Use guzzlehttp/guzzle instead.**
Writing lock file
Generating optimized autoload files