update docs for updateRoute
update docs for updateRoute

nashibao/mailgun-js,jonnyjon/mailgun-js,Urvishic/mailgun-js,1lobby/mailgun-js,AdamMagaluk/mailgun-js,svengau/mailgun-js,chilts/mailgun-js,sohel-khalifa/mailgun-js,mhgbrg/mailgun-js,avbel/mailgun-js,Ferrari/mailgun-js,omrisivan/mailgun-js,bakat/mailgun-js,bojand/mailgun-js,soplakanets/mailgun-js,SeyZ/mailgun-js,RichardLitt/mailgun-js,jfaissolle/mailgun-js,wpic/mailgun-js,amoshaviv/mailgun-js,abacuslabs/mailgun-js,ErwanLent/mailgun-js