Mailgun::Client custom logger

[n-rodriguez]

Hi there!

It would be nice to pass a custom logger to Mailgun::Client / Faraday for debugging like in Faraday documentation :

conn = Faraday.new(url: 'http://httpbingo.org') do |faraday|
  faraday.response :logger, MyLogger.new($stdout)
end

https://github.com/mailgun/mailgun-ruby/blob/d6ffaa0d2ce27c88c45a8080ca5693e312a82803/lib/mailgun/client.rb#L35C1-L41

See: https://lostisland.github.io/faraday/#/middleware/included/logging?id=customize-the-logger

Unfortunately Mailgun::Client constructor is not easy to use with positional arguments. It would be easier with keyword arguments.

So I would suggest to deprecate positional arguments and switch to keyword arguments first.

Thank you!