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

mailgun-ruby/lib/mailgun/client.rb

Lines 35 to 42 in 74db0e4

	@http_client = Faraday.new(request_options) do |conn|
	conn.request :multipart
	conn.request :authorization, :basic, 'api', api_key
	conn.request :url_encoded
	conn.response :raise_error, include_request: true
	conn.adapter Faraday.default_adapter
	conn.options.params_encoder = Faraday::FlatParamsEncoder
	end

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!