Add option to sanitize sensitive headers

[stfndamjanovic]

This PR adds the possibility to sanitize some headers that shouldn't be stored in logs, especially if you are using some third-party logging driver. For example, most likely we don't want to send jwt tokens from the Authorization header, or some IP addresses, etc. Because of that, I added one more configuration field to define headers that should be sanitized before sending.

I didn't want to add some headers in the configuration by default, because maybe it would be backward incompatible since it would be a change of existing behavior.

Let me know if you have any questions or suggestions. 😊

[freekmurze]

Thanks! Could you uptime the readme as well?

[stfndamjanovic]

Of course. It's done. Please check if everything is clear enough.

[stfndamjanovic]

@freekmurze is there anything that I need to change?

[freekmurze]

Thanks!