Allow using native debug logging in CORS middleware

[delolmo]

neomerx/cors-psr7 supports debug mode with a PSR-3 Logger Interface. The proposed changes allow passing such a logger to the object constructor so that logging can take place.

[oscarotero]

Hey, thank you. Good addition, but I think this option should be passed using a method, instead using the constructor. The general rule is: constructors only accept the most important argument of the middleware: the router instance, whoops instance, cors settings instance, etc. The other optional settings are passed through methods. So I'd do something like this:

$middleware[] = Middleware::cors($settings)
    ->logger($logger);

What do you think? Do you mind make this change?

[delolmo]

Done!

[oscarotero]

Good job! Thank you