docs: def difficulties_by_voivodeship(voivodeship, dt=datetime.now()):
      """
      Get difficulties in voivodeship.
  
      :param voivodeship: Voivodeship numeric value.
      :param dt: Datetime for data. Default: datetime.now()
  
      :return: List of difficulties by voivodeship.
      """
      session = requests.Session()
      session.headers.update({'User-Agent': USER_AGENT})
      session.headers.update({'X-Requested-With': 'XMLHttpRequest'})
      
      session.get('{}/Mapa/'.format(HOST))
      
      url = '{}/Mapa/PodajUtrudnieniaWWojewodztwie?KodWojewodztwa={}&_={}'.format(HOST, str(voivodeship), _datetime_to_asp_date(dt))
      response = session.get(url)
      
      json_data = response.json() if len(response.text) > 0 else []
      return json_data