v1.0.0

• feat: Better error handling.
  • Rediscover internet gateway when the UPnP request fails.
  • Add -v, --verbose flag for enabling debug printing.
  • Do not look at the RUST_LOG environment variable anymore.
• feat: Remove auto-detecting the configuration file. Now always expects the config file as the first argument.
• Update and improve README.
• Update dependencies.
• Publish on crates.io.