Error with https://swissdomains.ch

exception = HTTPSConnectionPool(host='swissdomains.ch', port=443): Max retries exceeded with url: / (Caused by SSLError(SSLCertVerificationError(1, "[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'swissdomains.ch'. (_ssl.c:992)")))