The collector formatter needs to implement Http\Message\Formatter::formatResponseForRequest

[stof]

PHP version: any

Description
A new Http\Message\Formatter::formatResponseForRequest has been soft-introduced in the Formatter interface in php-http/message 1.13.0 (see https://github.com/php-http/message/releases/tag/1.13.0).
Currently, the bundle triggers a deprecation warning due to not implementing the method.

How to reproduce

Possible Solution
Implement the new method in the formatter.

Additional context

[dbu]

thanks for reporting @stof , i am fixing it in #413