Incompatibility with `php-http/message` package

[emr]

http://docs.php-http.org/en/latest/clients/curl-client.html
I just followed steps on the page.

And there are 2 packages now in my composer.json:

"require": {
    "php-http/curl-client": "^2.0",
    "php-http/message": "^1.7"
}

http://docs.php-http.org/en/latest/clients/curl-client.html#usage
I've copied one of these code snippets and I noticed there is an incompatibility.

use Http\Client\Curl\Client;
use Http\Message\MessageFactory\DiactorosMessageFactory;
use Http\Message\StreamFactory\DiactorosStreamFactory;

$client = new Client(new DiactorosMessageFactory(), new DiactorosStreamFactory());

php-http/curl-client package is working with Psr\Http\Message\... interfaces. But php-http/message package implements Http\Message\... interfaces.

When I changed the version "php-http/curl-client": "^2.0" to "^1.7", the incompatibility is solved. Curl client works with Http\Message\... interfaces on ^1.7 version.

So, what is standard?

Which versions of php-http packages work compatible with each other?