OpenVPN 2.6.3 not support default old AES-128-CBC data chipher

[evadogstar]

I found that server config downloaded from vpngate servers AES-128-CBC not supported by newer versions of OpenVPN.

to fix this I changed 207 line of _cli.py to

    command = ['openvpn', '--config', ovpn, '--data-ciphers', 'AES-128-CBC']