Allow psr/http-message ^2.0

[valzargaming]

Requires php: ^7.2 || ^8.0, but still allowing usage of ^1.0 maintains backwards compatibility with the current PHP requirements Closes #513

[thyagomuris]

@clue @WyriHaximus would it be possible to get some eyes on this and released if all good?

[marcelfolaron]

Hi, what is the latest on this PR? Will this be merged? This is creating an incompatibility with the AWS SDK which requires 2.0

Thanks.

[kwhat]

@marcelfolaron I believe that is the goal. I think the part holding us back right now is the PR to clue/reactphp-http-proxy which would allow us to keep that examples/11-client-http-proxy.php in the codebase.

[nunomaduro]

@clue can i help on anything to get this one merged?

[menturion]

Same here. I am not able to use "react/http". Many other packages are downgraded just because of the "psr/http-message": "^1.0" dependency. Please merge this!

[RRosalia]

Any updates? Or any help needed we need this merged!