Changelog:
- Improved Wireguard config file parsing - PR #133 - thanks to @vulpyne
- Custom VPN provider file specified in vopono config file now works correctly - PR #135 - thanks to @vulpyne
- Wireguard config file should now work when DNS key is missing - PR #136 and discussion in #135
- Switch to clap v3 over structopt for parsing command-line arguments - PR #136 - should be fully back-compatible but please create issues for any problems found