Failure on client exception

[PedroPMS]

I'm having a "problem" where requests that return 4xx are thrown a client exception. This library treats any error as failure of the circuit breaker, which forces the non-use of guzzle Exceptions, having to deal with the status code.

I was wondering if it makes sense to handle Guzze's RequestException with the executeCircuitBreakerOnResponse method instead of just throwing the exception and mark as failure.