Add support for amphp/http-client-psr7 #240
Description
It's a PSR-18 client: https://github.com/amphp/http-client-psr7/ compatible with fibers.
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It's a PSR-18 client: https://github.com/amphp/http-client-psr7/ compatible with fibers.