Better errors, not allowed option

[arturictus]

When wrong use of the library

 module Worldmate
  class HotelToBaobabMapper < HashMap::Base
    property :hotel_name, key: :name
    from_child :address do
      property :street, key: :address
      property :phone, key: :telephone
      property :postal_code, key: :zip
      properties :city, :country_code
    end
  end
end

the error:
NoMethodError: undefined method `reverse' for :name:Symbol

the good syntax is:

property :name, from: :hotel_name

But the error should help better to know what is happening