Allow purevpn wireguard

[lordbah]

I tried to configure for PureVPN WireGuard after downloading config info as per https://support.purevpn.com/en_US/linux/how-to-setup-wireguard-on-linux only to get the gluetun error message 2023-10-23T21:32:02-04:00 ERROR VPN settings: provider settings: VPN provider name is not valid for Wireguard: value is not one of the possible choices: purevpn must be one of airvpn, custom, ivpn, mullvad, nordvpn, surfshark or windscribe I then changed "purevpn" to "custom" and got the error 2023-10-23T21:36:25-04:00 ERROR VPN settings: provider settings: server selection: for VPN service provider custom: the country specified is not valid: one or more values is set but there is no possible value available which is likely true if searching in servers.json. It looks like they have at least one endpoint at sx051007-wg.pointtoserver.com:51820.

I read elsewhere (https://www.reddit.com/r/PureVPNcom/comments/zjwrar/wireguard_configuration_requires_regeneration/) that their key expires. If that's still true, this probably wouldn't be useful.