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I am proposing a small PR to fix a deprecation warning when using Guzzle 7.1+
Extending Guzzle\Client is deprecated since Guzzle 7.1 and the class is annotated as @final. The class will be actually final in Guzzle 8.0.
See guzzle/guzzle#2521
This would be a BC change, but since you're thinking of making a 5.0 release, this would be the time.