Support psr/http-message 2

[kylekatarnls]

Hello, 👋

php-fig recently published psr/http-message 2 adding strong types. Do you plan to support it and/or need help for that?

Thanks. 🙏

[crabmusket]

This looks like it's fixed in 5.2.0, but composer.json still requires psr/http-message:^1.1 which doesn't let me install 5.2 at the same time as http-message 2.

[wimhendrikx]

You can install it with --with-all-dependencies for now.

[ksvirkou-hubspot]

Hi everyone. The support of psr/http-message:^2.0 was added in the latest version.