Faraday middleware that VCR uses to record and replay HTTP requests made through Faraday.
@note You can either insert this middleware into the Faraday middleware stack
yourself or configure {VCR::Configuration#hook_into} to hook into `:faraday`.
Constructs a new instance of the Faraday middleware.
@param [call] app the faraday app
Handles the HTTP request being made through Faraday
@param [Hash] env the Faraday request env hash
[Validate]