Get difficulties in voivodeship.

    :param voivodeship: Voivodeship numeric value.
    :param dt: Datetime for data. Default: datetime.now()

    :return: List of difficulties by voivodeship.

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