[HttpClient] Fix specifying http_version in YAML

[pableu]

With the code from the docs, I get this exception:

Unrecognized option "http_version" under "framework.http_client". Available options are "default_options", "enabled", "max_host_connections", "mock_response_factory", "scoped_clients".

Maybe the XML and PHP Annotation also needs a fix, but I don't feel confident doing that.

[carsonbot]

Hey!

Cool, it looks like you have quite a talent.

But you have made this PR towards a branch that is not maintained anymore. :/
Could you update the PR base branch to target one of these branches instead? 4.4, 5.2.

Cheers!

Carsonbot

[javiereguiluz]

Pablo, thanks for fixing this bug! While merging we've updated the XML and PHP configs too. We merged it in 4.4 and all the upper branches. Thanks!

[pableu]

Cool, thanks for improving my fix 🙂