@type holiday() :: %{
  id: number(),
  uuid: binary(),
  name: String.t(),
  description: String.t(),
  country: Calendarific.Types.Country.t(),
  date: Calendarific.Types.Date.t(),
  type: [String.t()],
  locations: String.t(),
  states: [Calendarific.Types.State.t()] | String.t()
}