yas99en

I found a bug. ``` $ sudo ./target/debug/doh-client -l 0.0.0.0:53 -d dns.google -r dns.google:443 --proxy-host 192.168.1.108:3128 --proxy-scheme http /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem error: The argument '--proxy-scheme ' cannot be used with one or...